oil weight
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,443
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I would say no because it is very thick. But the ultimate guide is your oil pressure gauge and how long it takes to get up to operating temp.
I use 10w-30 Val VR1 in my 434 ci race motor and have 80 psi at 210 water over 4000 rpm. If I switched to 15W-50 it would be 80 psi all the time.
I use 10w-30 Val VR1 in my 434 ci race motor and have 80 psi at 210 water over 4000 rpm. If I switched to 15W-50 it would be 80 psi all the time.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,112
From: Crossville TN
I wouldn't use anything higher than 30 weight in cold areas. I don't know if Mobil1 sells a 5W30 synthetic, but that's what I would recommend...especially if you will be parked outside at all 
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Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
Le Mans Master
Joined: Oct 2007
Posts: 7,410
Likes: 949
From: Tennessee/Rhode Island
I too use Mobil 1 15W-50 all year round. If you are going to use Mobil 1, make sure that you use 15W-50 only in flat tappet cam engines since it is the only Mobil 1 with 1,200 PPM of ZDDP, necessary for flat tappet cam engines. The 15W-50 Mobil 1 will flow extremely well in very cold temperature since it acts like a 15 weight oil when cold and will easily outflow an organic weight oil which is like mud at 0 degrees since it is synthetic. Try pouring a conventional 10W or 5 W oil out of the container at 0 degrees and then pour some Mobil1 15W-50 at the same temperature and see which one flows better.
Le Mans Master
Joined: Oct 2007
Posts: 7,410
Likes: 949
From: Tennessee/Rhode Island
I do not use the extended performance Mobil 1 15W-50, the "regular" 15W-50 is what I use since I change the oil annually with about 1,000 miles on it. The EP and standard Mobil 1 15W-50 both have the same amounts of ZDDP, 1,200 PPM, no difference.
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Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
i keep cases of the EP stuff on hand to run in both of my sportbikes.
when i got my vette it had rotella synth in it so i figured i was gonna stick with that but it looks like not anymore.