There are plenty of oil analysis posted that show this car does fine with 4-5k intervals with PP and that fuel dilution seems to be an isolated problem. I've seen more where it's not a problem than ones where it is. Most of them show that viscosity was slightly thin, but with no fuel dilution, which means heat is the issue shearing the oil.
Our manuals say 7,500 for "Schedule 1" (non-severe conditions) and 5,000 for "Schedule 2" (severe conditions). I have not seen anything that says 3,000 miles.
I have heard many good things about the PP, but have stuck with M1 since I have heard the rumors that Penzoil causes sludge/wax build up or used to. I have had a few cars go for a very long time on M1.
Pennzoil's conventional oils are notorious for this. I cringe every time I see someone on here mention a Pennzoil product in a positive light because of it, but I'm beginning to think their synthetic product is a good deal different from their conventional.
I use Mobil 1 and Royal Purple exclusively in my turbocharged vehicles. Castol conventional in my naturally aspirated ones. Not a big fan of Castrol Syntec.
A good-running EFI motor should never suffer from "fuel dilution."
I talked to a guy that worked for BP oil and they own castrol . He was telling me that BMW does not use moble 1 because it has zinc in it . The zinc in the oil reacts to the magnesuam block and ***** it up I use castrol sys
Actually, he told you wrong. None of the Mobil 1 formulations use Zinc. I'm not sure any pure synthetics do. However, conventional base blends like Syntec and some of the Valvoline synthetics do have Zinc in some viscosity ranges.
I don't have a clue about Zinc and Magnesium reacting. Zinc has been disappearing from motor oil because it's rough on the emissions equipment, and that has made it tough for old car guys to find oil that will help their cast iron, flat tappet hardware survive.
Zinc is excellent at reducing high pressure wear when there's metal to metal contact, like with flat tappet cams and press-fit wrist pins at the piston.
I talked to a guy that worked for BP oil and they own castrol . He was telling me that BMW does not use moble 1 because it has zinc in it . The zinc in the oil reacts to the magnesuam block and ***** it up I use castrol sys
One dealer told me that synthetic oil holds heat better, and thus trasnfers it to the turbo. To me it sounded like he had a misunderstanding of how synthetic oil works.
^^No, It was the one in Wellesley, but I have heard it from others as well. I think the guy who gave me the best answer was from the Norwood. He told me that Mazda used to not support synthetic oils because of the RX-7/8, but have come around and started oking it for all their cars except the RX as long as it meets their requirements.
I dont know if this helps but when i had my dodge neon SRT4 the manual specifically stated to use Mobil one fully synthetic. If synthetic is bad for the turbo then mazda can licks my balls for making a GAY turbo
