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Old 08-02-2015, 07:42 PM   #1
docrocket1967
 
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Mobil 1 Question

Planning on doing my own services and not letting the dealership do them. I have always run Mobil 1 Full Synthetic in my LS Engine cars. I questioned it when i built my LS1 because the cam bearings didnt look that great for always staying on top of my oil changes but i found out that for the mileage i had it was about normal. My LS3 has 20,000 miles on it so should 5w-30 Mobil 1 Full Synthetic be just fine and at what mileage should i step it up to 10w30? Thank you for the help.
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Old 08-02-2015, 07:54 PM   #2
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Personally, first thing I did when I bought my car, was to dump the M1. But then again, I'm an oddball here because I don't use synthetics. If you are really hardcore about motor oil, you will read articles till your eyes bleed......and still not get a definite answer. The reading I have done tells me M1 has slipped over the years and is considered by some as crap. There are better oils out there these days. I have always maintained.....run whatever you want....the key is changing it at regular intervals.
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Old 08-03-2015, 11:55 AM   #3
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Ok ill definitely keep that as food for thought. All brands aside is 5w-30 good for 20,000 miles on a LS3? What mileage should i jump to 10w-30
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Old 08-03-2015, 12:17 PM   #4
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I run Royal Purple 5-30, if you are out of warrantee or don't care about it RP makes a much better high performance oil but not rated as approved, still 5-30. You may want to check it out. I run RP front to back, engine tranny and diff
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Old 08-03-2015, 12:24 PM   #5
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The first number is the cold viscosity, 5w30 and 10w30 have the same operating temp viscosity. There really isn't a reason that you need to deviate from the recommended 5w30. A couple of us track guys have noticed better temps while maintaining good protection running 5w30 on track over say.... 0w40 or 15w50. I also don't think there's much harm in running a different weight if you prefer.
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Old 08-03-2015, 01:38 PM   #6
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Here's all you'll ever need:

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Old 08-03-2015, 05:28 PM   #7
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Mobil 1 10w-30 High Mileage is a different oil from their other products. I suspect it's an earlier formula. If you look at the specs it is API SL (older spec) and ACEA A3 (which means an HTHS of 3.5 or higher which I like). This is a thick 30 that can take abuse. 10w-30 will have fewer or possibly no viscosity improvers compared to 5w-30, so it breaks down less. 10w is (a little) thicker when cold, but in FL not a worry. I would say this is similar to Joe Gibbs LS30.

The other Mobil 1's are GF5 rated "thin" for fuel economy. Fine for street driving but I think they thin out too much at high temps so I don't use GF5 oils since I track the car occasionally and live in a warmer climate.
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Old 08-03-2015, 07:22 PM   #8
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You'll never need to go to 10W-30. Any name brand 5W-30 meeting GM specs will completely suffice with regular change intervals for probably the entire life of the engine.

Unless you race it or drive it *hard*, it's all personal preference.
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Old 08-03-2015, 07:45 PM   #9
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Quote:
Originally Posted by docrocket1967 View Post
Ok ill definitely keep that as food for thought. All brands aside is 5w-30 good for 20,000 miles on a LS3? What mileage should i jump to 10w-30
Again, I'm the outcast.....I run Shell Rubella 10w30. I have run 10w40 with no dire affect. I used 20w50 in my cammed '06 GTO. So, that being said, you can use 10w30 if you like....no real need to, tho. 20k on these engines is barely considered broke in. Stick with your 5w30 M1if you like....I'm just saying you could probably do better. But using M1 wont cause your car to explode.
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Old 08-03-2015, 09:10 PM   #10
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Thank you all for your responses and time. Good information to have. Ive been running 10w30 in my built LS1 for as long as i can remember. I was always under the impression the higher in mileage you get the thicker the oil that should be used so i had tried 20w50 at one point and only noticed the oil pressure gauge run a little lower than with 10w30 but no other noticeable differences.
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