Thoughts?
Mobil 1 10w-30 HM vs. Mobil 1 0w-40
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Totally different oils, but probally would produce the same result. The 0w-40 I'd use in a newer car and the 10w-30 HM in an older car. If temps were lowered, that would make a difference. The 10w-30 HM is cheaper.
I never lost connecting rod and main bearings or rear wheel bearings (rear wheel drive) on two cars until I used Mobil 1 synthetic oil. They had major problems with their aviation version of synthetic engine oils, too. Yes, I am aware that Corvettes come with the stuff. But think about it. A Corvette engine is one of the most lightly loaded engine applications on the planet below 100 MPH. I don't keep up with NASCAR, but do any of those applications use synthetic oils?
I'd pick whichever one's the closest to 12 cSt @ 100C.
What is your application and how cols does it get in your area this winter? I'd give the 10w-30 a slight nod due to the possibility of keeping your engine cleaner or removing existing sludge.
I will be using HM M1 10w-30 next spring once temps are solidly above 25 degrees or so to see how it cleans up the slight varnish on my 98 Civic I just acquired. $19.xx or so at China-Mart for a 5 quart jug is great deal.
I will be using HM M1 10w-30 next spring once temps are solidly above 25 degrees or so to see how it cleans up the slight varnish on my 98 Civic I just acquired. $19.xx or so at China-Mart for a 5 quart jug is great deal.
So far, UOAs of both M1 HM oils have been very good, but there aren't any I've seen that severely test the long drain capability that M1 0W-40 has shown (and must show to meet the specs it does). I've done volatility tests on these two oils and found early-on they have nearly identical volatility...which is on the low side relative to other synthetic 30 and 40 wt. oils. Certainly top notch basestocks are used in both these oils. A cool member here did aniline point tests on both these oils and the temperature results were close. I've posted the numbers in a thread in the Euro oil forum if you care to see.
I've used M1 0W-40 many times in a VW 1.8T driven hard and am currently using M1 10W-30 HM. Startups are smoother for sure with the 10W-30 HM and so far the gas mileage obtained from both are similar. Note that use of most of the other synthetics I've put in this engine has negatively affected the gas mileage.
I'm sure that M1 0W-40 uses quite a bit more polymeric viscosity index improvers than M1 10W-30 HM yet they have nearly same virgin HTHS viscosity. Viscometric-wise, this makes the latter a no-brainer as more ideal for me and many others. The rest of this contest is up to the additives...time will tell which one seems better for this and that application.
I've used M1 0W-40 many times in a VW 1.8T driven hard and am currently using M1 10W-30 HM. Startups are smoother for sure with the 10W-30 HM and so far the gas mileage obtained from both are similar. Note that use of most of the other synthetics I've put in this engine has negatively affected the gas mileage.
I'm sure that M1 0W-40 uses quite a bit more polymeric viscosity index improvers than M1 10W-30 HM yet they have nearly same virgin HTHS viscosity. Viscometric-wise, this makes the latter a no-brainer as more ideal for me and many others. The rest of this contest is up to the additives...time will tell which one seems better for this and that application.
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