currently run rotella t 15w40, thinking of going to their 5w40 syn, should i? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Maintenance & Fluids Discuss products, techniques, intervals, and fluids for maintaining your GM truck including oil and oil additives, fuel and fuel additives, alternative fuels (Bio-D, SVO, WVO), filters, grease, and maintenance specific tools.

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Old 12-22-2008, 10:51 AM   #1 (permalink)
wildman738
 
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currently run rotella t 15w40, thinking of going to their 5w40 syn, should i?

I know the syn is better, not question there...but I wish rotella made their syn in a 15w40 weight..I don't like the idea much of 5w40 in my truck seems like the heavier oil would protect on startups better etc...

I know thinner oil gets to tight places a little quicker...i dunno what to do it's an 05 with 57k miles on it. transyn is already in the trans did that last week

so stay with the 15w40 rotella t/triple protection or go with 5w4o syn rotella?

can't go wrong either way i know...just wanting op's


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Old 12-22-2008, 02:23 PM   #2 (permalink)
Dirtbikindad393
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Synthetic oils are definitely better for wear and they run cooler than a dino oil. The area where synthetics shine is breakdown, it won't breakdown as fast as a dino which if your wanting to save money by extending your OCI synthetics is the only way to go. Synthetics can take more heat before losing viscosity and breaking down causing wear.

Amsoil makes a 15W-40 that is a very high quality oil and keeps you in the mfg recommendations for oil weight. That is what I run in my truck 15k miles then change. I know I could go longer but 15k is what Amsoil gaurantees for severe service so that is what I go.

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Old 12-22-2008, 03:52 PM   #3 (permalink)
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As far as engine wear goes it would be a wash. If you live in a severely cold climate or extend OCI's out past 20K miles or so (with the use of bypass filtration) then syn might be the better choice. Other than that dino will afford you equal protection to that of synthetics.
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Old 12-22-2008, 05:45 PM   #4 (permalink)
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I'm not sure if just having thicker oil will help on start-ups when it comes to lubrication, but I think whats more important is that synthetic is better at creating a film on parts for good protection and lubrication. By the way I used the Rotella 5w-40 in all my trucks I never had a problem even with high mileage trucks or extended intervals.
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Old 12-22-2008, 07:32 PM   #5 (permalink)
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I like the fact that in the cold weather the synthetic flows a lot easier through the engine and protects it a lot quicker than an oil that is thick. This morning it was 12F out and the truck started fine with no loud engine knock. It was also plugged in and I put the front cover on.
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Old 12-22-2008, 11:49 PM   #6 (permalink)
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i went to advance before anyone replied and just got the regular rotella triple T 15w40 and changed it today.

I think either are great...if amsoil was easy to get to I would used that but it's not so.
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Old 12-23-2008, 07:15 AM   #7 (permalink)
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For myself the oil depends a lot on what climate you experience where you live. If I lived in the south or south west, I would use dino since I change my oil way to soon for a synthetic at around 5K.
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