Toro 21565
Engine oil for the Toro 21565
Short answer
Two oil numbers, not three: the 18 oz SAE 30 and the synthetic. Toro lists no 32 oz bottle for this machine, on any listing.
Verified options
What we have verified
| Part | Serial range | Status |
|---|---|---|
| 38916SAE 30 4-Cycle Summer Engine Oil 18 oz. | All | Confirmed fit |
| 138-6053Toro Full Synthetic 10W-30 Engine Oil (32 oz.) | All | Confirmed fit |
What decides it
The numbers that matter here
- Serial range
Irrelevant on this machine, for oil and for everything else
The 21565 is the only model here whose listings do not diverge anywhere. You do not need your serial to buy any part for it, which is the opposite of what most pages on this site are for.
- Bottle size
Only 18 oz (38916) is listed — no 32 oz
Worth checking against your own needs rather than assuming the larger bottle is available under this machine. Toro lists it for other mowers and not for this one.
- Grade
SAE 30 (38916) or full synthetic 10W-30 (138-6053)
Both are listed with no guidance on choosing. SAE 30 is a mono-grade for warm running and 10W-30 a multi-grade; your climate and the engine manual decide.
- One listing names nothing
420000000–420606376 publishes no accessory list
Not the newest run — two above it carry the full set — so an owner inside that window can read the answer off the runs either side, which agree.
In detail
Choosing engine oil for this mower
The 21565 is the one machine on this site where nothing at all depends on your serial — and the one where an oil number that appears everywhere else is missing.
Every listing that names accessories names an identical set. Not similar: identical. The same blade, the same chute, the same kit, the same oils, on every one of them. No part enters at a serial and none leaves. That is why this machine has no serial-range pages: there is no divergence to write one about, and the fitment records here are scoped to the model rather than to a range because the listings give no reason to split them.
Within that set the oil is 138-6053, the full synthetic 10W-30, and 38916, SAE 30 in an 18 oz bottle. **38903 — the same SAE 30 in 32 oz — is named on none of them.** Every other machine on this site that lists SAE 30 lists both sizes side by side; the 21565 lists only the small one. We opened 38903’s own product page as well as these listings, and this is a statement about what Toro puts on the 21565’s pages rather than about whether the bottle would suit the engine.
One listing, 420000000–420606376, publishes no accessory list at all. It is not the newest — two runs above it name the full set — so it is a gap rather than a page still being filled in.
Toro publishes no sump capacity here, which matters more on this machine than most: with only the 18 oz bottle listed, whether one is enough is a question the engine manual answers and the parts page does not.
The mistake we see most
Method
How we established this
We opened all ten listings Toro publishes for model 21565 and recorded which accessories each names. Every listing that names any names the same set, which is why the fitment records are model-scoped. The absence of 38903 was checked against those listings and against 38903’s own product page.
Same machine
Other parts we have verified for the Toro 21565
Other machines
Engine oil on the other mowers we cover
The answer is not the same on every machine, which is the point of checking rather than assuming.
Provenance
Sources
Last verified against these sources on August 29, 2026.
- 1
Parts — 21in Super Recycler, model 21565, serial range 400000000–411499999
The Toro Company · Primary source · Accessed August 21, 2026
Earliest published range. Lists 108-3759-03 (21 Inch Standard Bagging Blade), 130-8148, 144-0242 (ASM-CHUTE, DISCHARGE), 490-2012 and 490-7462.
- 2
Parts — 21in Super Recycler, model 21565, serial range 411500000–412110342
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range. Its accessory list names none of the parts this site holds beyond those it names for every other run of this model number; nothing on it distinguishes this range from its neighbours. The page carries further items this site holds no record for, among them engine oils, a bag and a striping kit.
- 3
Parts — 21in Super Recycler, model 21565, serial range 412110343–412899999
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range. Its accessory list names none of the parts this site holds beyond those it names for every other run of this model number; nothing on it distinguishes this range from its neighbours. The page carries further items this site holds no record for, among them engine oils, a bag and a striping kit.
- 4
Parts — 21in Super Recycler, model 21565, serial range 412900000–415199999
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range. Its accessory list names none of the parts this site holds beyond those it names for every other run of this model number; nothing on it distinguishes this range from its neighbours. The page carries further items this site holds no record for, among them engine oils, a bag and a striping kit.
- 5
Parts — 21in Super Recycler, model 21565, serial range 415200000–418291622
The Toro Company · Primary source · Accessed August 21, 2026
A middle range. Lists 108-3759-03, 130-8148, 144-0242, 490-2012, 490-7462 and 130-2393.
- 6
Parts — 21in Super Recycler, model 21565, serial range 418291623–419019999
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range. Its accessory list names none of the parts this site holds beyond those it names for every other run of this model number; nothing on it distinguishes this range from its neighbours. The page carries further items this site holds no record for, among them engine oils, a bag and a striping kit.
- 7
Parts — 21in Super Recycler, model 21565, serial range 419020000–419999999
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range. Its accessory list names none of the parts this site holds beyond those it names for every other run of this model number; nothing on it distinguishes this range from its neighbours. The page carries further items this site holds no record for, among them engine oils, a bag and a striping kit.
- 8
Parts — 21in Super Recycler, model 21565, serial range 420606377–421192966
The Toro Company · Primary source · Accessed August 21, 2026
Toro’s official parts listing for this model and serial range. Its accessory list names none of the parts this site holds beyond those it names for every other run of this model number; nothing on it distinguishes this range from its neighbours. The page carries further items this site holds no record for, among them engine oils, a bag and a striping kit.
- 9
Parts — 21in Super Recycler, model 21565, serial range 421192967–999999999
The Toro Company · Primary source · Accessed August 21, 2026
The latest published range. Lists 108-3759-03, 130-8148, 144-0242, 490-2012, 490-7462 and 130-2393.
- 10
Parts — 21in Super Recycler, model 21565, serial range 420000000–420606376
The Toro Company · Primary source · Accessed August 21, 2026
Toro publishes this listing for the model and serial range, and it carries no accessory list at all — assembly drawings, a downloadable parts catalog and manuals only. We opened it and there is nothing on it to record, which is why no fitment on this site is scoped to this range. That is different from a part being absent from a list: this page makes no statement about any part.
- 11
SAE 30 4-Cycle Lawn Mower Engine Oil 32 oz (Part # 38903)
The Toro Company · Primary source · Accessed August 29, 2026
The number requested, answered without a redirect and with no “Replaces Product” line in either direction. Toro describes it as a mono-grade fluid for high-temperature use and states it “meets or exceeds performance requirements of all OEM products (Toro®, Briggs & Stratton®, Kohler®, Honda® and Tecumseh®)”. It names engine makes and no machine, model or engine number, so it establishes the product and not the fitment.
- 12
SAE 30 4-Cycle Summer Engine Oil 18 oz. (Part # 38916)
The Toro Company · Primary source · Accessed August 29, 2026
The number requested, no redirect and no “Replaces Product” line. Same mono-grade SAE 30 description as 38903 and the same list of engine makes, in an 18 oz. bottle rather than 32 oz. The page is marked “Not Available Online”, which is a statement about Toro’s own checkout and not about whether the oil is listed for a machine. This is the bottle kit 20298 itemizes.
- 13
OIL-30/10W-30 SYNTHETIC CK4 [QT] (Part # 138-6053)
The Toro Company · Primary source · Accessed August 28, 2026
The same page served at its own number, and it is the same page carrying that one “Replaces Product 117-0066” line — so Toro states the supersession once and either number reaches it, which is not the same as stating it from both directions. This page is now also the source for part 138-6053 itself: batch 13 created the pt_engine_oil category, so the clause that used to sit here — that engine oil is in no category this site records — stopped being true the moment that batch was staged.