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What Syn oil do you all use and what wt

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Old 07-27-2017, 05:40 AM   #1
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Default What Syn oil do you all use and what wt

what Wt of oil do you all use and what brand do you use.
here where im at in MO its been hot. over 100 often the past few weeks.
when I got my car I changed the oil on it pretty quick since it had a jiffy lube sticker in it
because of the heat I put 10w30 Royal Purple in it.
has ran fine but wanted to get your alls opinion on it.
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Old 07-27-2017, 06:08 AM   #2
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It's gonna vary based on the build. With that said i run VR1 20w50
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Old 07-27-2017, 06:18 AM   #3
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mine is all stock motor
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Old 07-27-2017, 11:00 AM   #4
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I use pennzoil platinum 10w-30
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Old 07-27-2017, 01:54 PM   #5
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I like M1 0w40 for (stock short block) LS1 applications.
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Old 08-05-2017, 03:24 PM   #6
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Amsoil Signature Series 5W-30 Synthetic Motor Oil (ASLQT-EA)

Retails for $12.05 a quart.
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Old 08-08-2017, 09:01 AM   #7
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New crate LS3 - M1 5w-30 as suggested by the builder. However, once we've got a few more miles on it, I'll likely give M1 0w-20 a try and see what impact on temps and pressures occur.
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Old 08-08-2017, 01:12 PM   #8
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Joe Gibbs LS30 is all I run in my WS6. It's a 5w30 oil.
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Old 08-08-2017, 01:16 PM   #9
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Rotella t6. 5w40
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Old 08-08-2017, 01:50 PM   #10
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Mobil 1 Synthetic 5w30. Car runs great

Last edited by sscamaroburn02; 08-09-2017 at 06:24 AM.
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Old 08-08-2017, 03:10 PM   #11
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1999 daily driver Z28, stock LS1 206k Valvoline Syn 5W-30, runs great

2002 SS garage queen 10k miles gets whatever GM dealer puts in it, I would assume its Mobil 1 5W-30

Last edited by OwieVT; 08-08-2017 at 03:11 PM. Reason: typo
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Old 08-08-2017, 03:28 PM   #12
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Mine and friends' experience with dealers over the decades - they charge you for Mobil1, and who knows what they actually put in. Daughter just had a dealer oil change in her car, and there's a good amount of evidence that the hood was never opened....sad.

Sorry for derail - not a lot of dealer love.
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Old 08-13-2017, 09:27 AM   #13
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Currently M1 0w-40 (pre-2016 strength).

The current M1 0w-40 is called "FS"...and is somewhat lower viscosity and HTHS at 100 deg C. The newer M1 0w-40 has lost the mfg certs from BMW (LL-01) and Nissan. Not sure if I will go with FS next time around or go back to a stouter 30 grade (0w-30, 5w-30, 10w-30). Mine is 100% stock and I don't drive it all that hard. So an oil with 11.0-12.0 viscosity and HTHS of 3.5 should be more than enough protection.

M1's stout 30 grades are the 10w-30 High Mileage, and 0/5w-30 ESP. I might consider the HM next time, though I'm not a fan of extra seal swellers when you have no leaks. And the reduced detergents in the ESP I have to wonder about. I like the extra Zinc you usually get in a 30HM or 40 grade oil. The M1 0w-40 is loaded with Ca/Zn/Phos/Moly/Boron. Very high TBN too. It's only draw back might be the high % ash it leave behind and the little bit more of Cat loading from the heftier add package.

For now I want to stick with the non-Magnesium and non-Sodium motor oils. That leaves out all the 30 grade Valvoline and 30 grade Mobil 1 oils. Most of the European certified 40 grade oils out there are high Ca/high Zn/high Phos blends. Even Valvoline when jumping to the their stout 0/5w-40 MST oils leaves the sodium out to employ a high calcium oil. To make the decision harder, the fully Euro mfg certed Castrol Edge 0w-40 is a magnesium oil (it didn't used to be), while their 30 grades are not. Rotella T5/T6 5/10/15-40 grades are just fine in a hot weather climate and with a very stout add pack.

Since it sounds like the OP is in a hotter weather climate I'd recommend a strong 30 grade or one of the lighter 0/5w-40's synthetics (PP/M1/Castrol Edge,Valvoline MST). At a minimum in a hot summer climate I think you should do fine with a quality 10w-30 which reduces the shearing potential. Not a fan of Royal Purple, especially at the higher cost (show me a mfg cert approval). I do my own oil changes and they cost me under $20 for oil and filter. I get my Mobil 1 from Walmart at $22.88 and use the $12 M1 rebates that come out 2X per year ($10.88 net for a jug). I use the Fram Ultra Guard synthetic filters ($6-8) depending on source. I only put 1200 miles on per year so an annual oil change, with a filter change every 2 years (the Fram Ultra is recommended up to 15,000 miles). I could probably go a lot longer on both oil and filter.

Last edited by Firebrian; 08-13-2017 at 10:28 AM.
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Old 08-13-2017, 10:00 AM   #14
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Mobil 1 5w-30...
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