Mobil 1. It’s amsoil without the outrageous cost.
Always Mobil1
Just had my first oil analysis with penzoil platinum - black rock said I won’t need a change for around 5k miles with it
I've been running Pennzoil *Ultra* Platinum 5w-30 for the last 15k.
M44 1.9, Mobil 1 Super 10W40, though I have to admit I use Castrol Edge in everything usually.
I really like Mobil 1 0w40 European car formula, and for the filter, only OEM from the dealer.
I use Madza OEM filter with Pennzoil Ultra Platinum 0W-20 every 8,000 km to 10,000 km.
I personally like the Pennzoil over the Idemitsu high moly oil but it's mostly due to being more available in my area.
I do think the Pennzoil is slightly better fuel economy wise and comes out cleaner than the high moly but this is probably a placebo than anything.
Honestly I wouldn't have the guts to run it for that long. I run Pennzoil full synthetic with a Purolator boss filter and I still do changes every 5000 miles.
I once used the 20k mile oil, but changed it at 12k; my engine seemed to run nore smoothly, after that. I swore off longer oil change intervals and went back to regular Mobil 1.
It is good oil! The only recommendation for C5 Corvette's and other cars.
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