Castrol oil branding / grades USA v UK - 986 Forum - The Community for Porsche Boxster & Cayman Owners

pothole · 05-08-2011, 08:45 AM

Factory fill wasn't 0w40, though was it? Also, some argue that Mobil 1 ain't what it used to be. No idea whether this is true.

Idaho Red Rocket 3 · 05-08-2011, 06:12 PM

Well I have stayed with M-1 but I have the Castrol on the shelf in the garage. I just have not yet convinced myself to change it over. I actually do something many would think is odd. I use 5 quarts of the M-1 10W40 High Mileage and 4 quarts of M-1 Racing 4T 10W40 motorcycle oil. You see todays modern car oils in the US have been reformulated to SL/SM ratings for emissions and fuel economy. So much good additive stuff that is actually needed and good for the engine has been taken out. The motorcycle oil I use is still rated as SG which has many of the additives we need.

pothole · 05-09-2011, 03:14 AM

At this stage, I am totally flumoxed. Finding it very hard to choose an oil brand or grade. Bit of a nightmare! Need to get something ordered today and can't decide between 5w40 and 10w40.

Car is a 97 with 85,000 on the clock.

pothole · 05-09-2011, 05:01 AM

Went for Fuchs Titan 5w40. Wasn't cheap, but is on the Porsche approved list and is fully synth SL. Oh well.

litteng · 05-09-2011, 10:08 AM

Pothole: another 5w40 rated synthetic you may want to research if you haven't already looked at it, is

petrocan duron 5w40 synthetic.

when i was researching the specs all the data sheets were out of the UK , therefore i assume petrocan is marketing it over there. i am running it 3 vehicles, a 99 passat 1.8T, a 99 beetle tdi, and the 06 boxster, UOA from the first looked okay, i will drop the boxster in the fall just before i park it and do a UOA on it at that time