WXman
Well-Known Member
- Joined
- Mar 1, 2017
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- Location
- Central Kentucky
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- 2018 Wrangler Unlimited
- Occupation
- Meteorology and Transportation
Wasn’t the issue with the 12991 that they wanted to reduce turbo coking? Maybe they’re trading increased internal wear for decreased turbo wear?
Over on the oil forums where all the "experts" hang out, there's a big debate going about that. They are of the belief that API SN oils do not belong in a diesel engine, and the MS-12991 oils also do not belong since they are high in SAPS content. Those guys are of the opinion that FCA is just trying to get to the end of warranty period with the best fuel economy possible for CAFE scores, and they don't really care if your engine or emissions system dies at 101,000 miles.I would bet the real deal is that the MS-12991 keeps the DPF cleaner, lengthening it's lifespan.
It really does have the owners over a barrel. Do you run a diesel oil which is healthier for the engine and sacrifice 100,000 miles of warranty coverage? Do you run the spec'd oils to protect warranty, knowing that it's causing the engine to wear faster? What a mess.....
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