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Royal Purple 10W40 API CF


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The American Petroleum Institute has a classification CF for diesel engines. I just purchased some Royal Purple 10W40 for summer fill (manual indicates 10W40 for anything synthetic and ambient temps over 50 degrees F).

I noticed that the manual also indicates not to put anything in the crankcase that is not API SL rated or better.

Will it harm the engine to run it with the Royal Purple 10W40 API CF rated oil in the case? Please advise and many thanks in advance. :oops:

I own an '01 Box non-S with manual transmission. It is no longer under warranty but a warranty RMS repair is still under warranty.

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The American Petroleum Institute has a classification CF for diesel engines. I just purchased some Royal Purple 10W40 for summer fill (manual indicates 10W40 for anything synthetic and ambient temps over 50 degrees F).

I noticed that the manual also indicates not to put anything in the crankcase that is not API SL rated or better.

Will it harm the engine to run it with the Royal Purple 10W40 API CF rated oil in the case? Please advise and many thanks in advance.  :oops:

I own an '01 Box non-S with manual transmission. It is no longer under warranty but a warranty RMS repair is still under warranty.

I would not put in my Porsche because it's not approved by Porsche and 15W40 is to high. Only max allowed from what I've read is 5W40. It also states that "Only non-seasonal light running oils are now approved by Porsche." I/A/W Porsche 1701 Technical Information sheet located in the Boxster 986 TSB section on this website. But since you no longer have a warranty, I would probably follow what Porsche says because they are generally right about the engines they build except a few minor things such as loose cylinder sleeves and RMS leaks. :eek: Here is on interesting website about oil. Bob the oil guy Also here's Royal Purple oils site too; Royal Purple Oils

Edited by WARDHOG
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The American Petroleum Institute has a classification CF for diesel engines. I just purchased some Royal Purple 10W40 for summer fill (manual indicates 10W40 for anything synthetic and ambient temps over 50 degrees F).

Hi, Moose. I would be very hesitant to put an oil rated CF but with no SJ (current is SM) rating in my engine. The additive package in a CF only oil may or may not be compatible with a gasoline engine.

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