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WSS-M2C945-A is replacing the WSS-M2C925-A spec (Ford established specs). 5W-20 grades of full synthetic oils (not blends) from Castrol, Valvoline, AMSOIL and Mobil-1, all meet this spec. and are readily available at auto part stores.
WSS-M2C945-A is replacing the WSS-M2C925-A spec (Ford established specs). 5W-20 grades of full synthetic oils (not blends) from Castrol, Valvoline, AMSOIL and Mobil-1, all meet this spec. and are readily available at auto part stores.
Would you please share how you know C945A is replacing C925A? I'm no authority on oil, but I've found no persuasive authority that validates the equivalency of both specs. If Jaguar reissued its warranty-specified C925A spec for the 5.0L to C945A, things would be easier as many oil manufs carry the C945A spec.
Nothing to taking the cover off and replacing too. "Rubber grommet-over-stud" is a common fitment for engine covers these days. I have the "R," though I would expect to see a similar design for the other motors.
Just place your hands on the cover (on either side), equally spaced apart, and gently lift to release the two grommets on that side. Move over to the other side and repeat to release the other two grommets. Four in total. Cover comes off easily. To reinstall, I simply place my hands around the "J" and the "R" on each side of the cover and gently press to ensure all 4 grommets are properly seated. If you have the cover positioned correctly, you'll feel the grommets reseating themselves.
The pics show the grommet-stud locations. Pretty difficult to break anything. No plastic clips, i.e., no little PITAs to worry about). But, when you replace the cover, be sure you have the cover correctly aligned over the various cover cutouts (especially on the passenger's side) before pressing down on the cover.
Would you please share how you know C945A is replacing C925A?
Look at the data Redline data sheet (link below). Data sheets from other manufactures will confirm. WSS-M2C925-A specs conform to GF-4 specs. WSS-M2C945-A conforms to GF-5. GF-4 specs are less rigorous than GF-5. Any oil conforming to the latter meets or exceeds all of the specifications of the former. The top synthetic oil manufacturers don't bother to carry multiple spec grades. They will generally blend to the most rigorous specs they economically can.The top manufacturers are now blending to GF-5.
I appreciate your effort here. I should have worded my question better.
My concern is not whether C945A is more rigorous than C925A (to which we both appear to agree), but whether Jaguar has acknowledged C945A in place of C925A for use in the F-Type 5.0L under its warranty coverage. Stated differently, I was aware of the upgrade to GF-5 spec from GF-4 spec for the C945A oil. But, it's my understanding that Jaguar still specifies certain oil properties that are inconsistent with the requirement of GF-5, properties which call for the C925A (GF-4) formulation for warranty coverage.
I appreciate your effort here. I should have worded my question better.
My concern is not whether C945A is more rigorous than C925A (to which we both appear to agree), but whether Jaguar has acknowledged C945A in place of C925A for use in the F-Type 5.0L under its warranty coverage. Stated differently, I was aware of the upgrade to GF-5 spec from GF-4 spec for the C945A oil. But, it's my understanding that Jaguar still specifies certain oil properties that are inconsistent with the requirement of GF-5, properties which call for the C925A (GF-4) formulation for warranty coverage.
BINGO!!! That is the crux of the issue. If JLR has decided to stick with an older spec for whatever reason, then for warranty reasons, it behooves one to stick with their recommendation.
BINGO!!! That is the crux of the issue. If JLR has decided to stick with an older spec for whatever reason, then for warranty reasons, it behooves one to stick with their recommendation.
Other than Castrol, you are going to be hunting for NOS oil, then. 945 exceeds the 925 specifications. Of the top brands, it appears that the Castrol Edge Syntec is one of the few that doesn't meet the 945 specs, but is adequate to meet the 925 specs. Redline, AMSOIL and Mobil 1 meet both.
Jaguar probably stuck to the old (lesser) spec because that was the best spec available when the engine was developed.
More and more, manufacturers have marketing agreements with oil companies, which is the likely reason. Stickers are appearing in engine compartments (e.g. Mercedes recommends Mobil 1, Jaguar recommends Castrol, etc.)
While I cannot imagine that JLR would attempt to void someone's warranty for using a higher spec oil that meets or exceeds their recommendation, stranger things have happened. However, it's difficult to imagine that they could make that stick in court.
The bottom line is, the key to no-hassles warranty service is to have the dealer enter records for your car into the JLR system so that it is documented as having had all the recommended maintenance. For that, it's just easier to go to the dealer for annual service, at minimum.
It wouldn't surprise me if some JLR dealers are using oils other than Castrol, since they are independent businesses looking for the best deal.
More and more, manufacturers have marketing agreements with oil companies, which is the likely reason. Stickers are appearing in engine compartments (e.g. Mercedes recommends Mobil 1, Jaguar recommends Castrol, etc.)
While I cannot imagine that JLR would attempt to void someone's warranty for using a higher spec oil that meets or exceeds their recommendation, stranger things have happened. However, it's difficult to imagine that they could make that stick in court.
The bottom line is, the key to no-hassles warranty service is to have the dealer enter records for your car into the JLR system so that it is documented as having had all the recommended maintenance. For that, it's just easier to go to the dealer for annual service, at minimum.
It wouldn't surprise me if some JLR dealers are using oils other than Castrol, since they are independent businesses looking for the best deal.
Completely agree on each of your points. As time goes by, I find myself less and less surprised by just about anything that happens, heh. (BTW, take care back there. Looks like y'all back in the NE are in for some storm.)
Completely agree on each of your points. As time goes by, I find myself less and less surprised by just about anything that happens, heh. (BTW, take care back there. Looks like y'all back in the NE are in for some storm.)
Thanks, we are essentially unscathed in the DC area. It's NYC north that is going to get killed.
