I like Mobil 1, but it's so thin.

Messages
235
Location
Ar
I do alot of short trip driving so I get a little fuel mixed in with it and it's even thinner. On the last change I used Mobil Drive Clean Plus HM 10/30 w/ 1 quart of 10/30 M1. I wanted something a little thicker for the 95+ degree summer. Looks like I got it because I get at least 2MPG less than I got with Mobil 1. I know this is just theory, but what would I end up with if I mixed 3.5 quarts of M1 10/30 with 1 quart of 15/50? Would it still be a 30 weight? I know the only answer is probably a UOA, but I thought maybe someone else had already tried this and could chime in. Thanks
 

Patman

Staff member
Messages
22,011
Location
Guelph, Ontario
A lot of LS1 owners add 15w50 to their Mobil 1 5w30 or 10w30 in order to beef it up. I think with your ratio you'd probably thicken it up to a middle to high 30wt. If you wanted it to be a thin 40wt you'd probably have to add a bit more 15w50. As always, doing a VOA and UOA is the best way to see how the viscosity starts out and ends up.
 
Messages
706
Location
Boynton Beach FL.
[Roll Eyes] I feel like you if your car or truck holds like 4 1/2 qts I would put 4 M1 10/30 1/2qt 15/50 Synthetic. Then say you do a UOA or need to add put the other 1/2 qt in. Thats how I am doing it.The oil pressure goes up at idle by several lbs I see no harm in it and I bet you can go 7500 miles easy. [Big Grin]
 

Al

Messages
19,256
Location
Elizabethtown, Pa
A 25% mixture will be a higher 30 wt. You ned around a 50% mixture to get you in the lower 40 wt. I think a 25% mixture would be good for you.
 
Messages
666
Location
Triad, NC
I tried the M1 15W-50 plus M1 5W-30 mix in my new vette, can't say I notice any diff from straight M1 5W-30 .... luckily there is a solution to this problem ... it's called Castrol Syntec 0W-30 GC and will soon be in all my cars ... nice viscosity... perfect in my opinion ..otherwise I'd try M1 0W-40
 
Messages
951
Location
Loveland, Colorado
quote:
Originally posted by goldfinger: ... On the last change I used Mobil Drive Clean Plus HM 10/30 w/ 1 quart of 10/30 M1. I wanted something a little thicker for the 95+ degree summer. Looks like I got it because I get at least 2MPG less than I got with Mobil 1.
I'm guessing you lost mpg 'cuz you're using something which is no longer a full syn (along with other operating factors). Sure, it's a bit thicker, but not enough to cause the drop you're seeing.
quote:
Originally posted by goldfinger: I know this is just theory, but what would I end up with if I mixed 3.5 quarts of M1 10/30 with 1 quart of 15/50? Would it still be a 30 weight? ...
Take a look at this response from satterfi. From this information, I'd say two qts of 15W-50 & the remainder of whatever M1 xW-30 you like would still leave you in 30 wt territory.
 
Messages
3,593
Location
Outside smalltown, IL
I guess it's thin, but how much do you really need to thicken it up? Mobil 1 5W-30 or 10W30 - 100C viscosity = 10.0 cSt Mobil 1 0W-30 - 100C viscosity = 10.3 cSt Pennzoil 5W-30 or 10W-30 dino - 100C viscosity = 10.5 cSt Chevron Supreme 5W-30 dino - 100C viscosity = 10.8 cSt It's still a 30 weight. Does the 5%-8% difference really mean anything? Especially since the M1 is unlikely to shear down in use...
 
Messages
700
Location
USA
I don't believe that all oils run at the same temps. By using the cSt at 212f, you are fooling yourself. If a M1 runs 10 degrees cooler than the Pennzoil 5w-30, you will have a "thicker" oil at your operating temps.
 
Messages
3,593
Location
Outside smalltown, IL
quote:
Originally posted by JonS: I don't believe that all oils run at the same temps. By using the cSt at 212f, you are fooling yourself. If a M1 runs 10 degrees cooler than the Pennzoil 5w-30, you will have a "thicker" oil at your operating temps.
Another good point. That and M1's good resistance to shear would make this even less of an issue...
 
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