Oil Specs
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Trailering
Joined: Apr 2025
Posts: 16
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Oil Specs
I was calling around to get a good deal on motor oil(5w20), and I found out about specs. The specs for my truck, which I got from a guy from Advanced Auto Parts, didn't know what it meant exactly. But on his computer the 5w20 spec included: WSSM2C945A. I'm not really sure if that is important or not. But seems like it will be a little hard finding it exactly, and at a good decent price. For any vehicles I've owned in the past I've only gone off the winter and viscosity numbers. Should I be concerned with this WSSM2C945A spec number? Thanks in advance.
Hotshot
Joined: Jul 2005
Posts: 11,931
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no.... just get the 5W20 spec with the latest "SP ... or SN " code
What the "S" code signifies
What the "S" code signifies
- "S" (Service/Spark Ignition): Indicates the oil is formulated for gasoline-powered cars, vans, and light trucks.
- The Second Letter (e.g., N, M, L, K, J, G): Shows the oil's performance tier; newer letters (SP > SN > SM > SL > SJ) mean better protection and features like:
- API SP (Latest): Protects against Low-Speed Pre-Ignition (LSPI), timing chain wear, and high-temperature deposits.
- API SN: Good for 2020 and older engines, better high-temp/sludge protection than older specs.
- API SM/SL/SJ: Older standards for earlier engine models, but higher specs are backward compatible.
Last edited by steve(ill); Dec 30, 2025 at 07:56 PM.
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