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Kind of interesting, but today is the second Chev service department talking me out of changing over to synthetic. I've been mulling this over for a bit. Have an 06 Duramax & wondering why two different dealers would not think it's worth the investment. Any ideas? Thanks,
 

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Im Superrrrr!
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its prob cause they want you to come change it our more often...resulting in more cash spent.

But synthetics are completely worth it.
 

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They prob make more money per litre selling you there house brand of mineral oil. Synthetic is worth the money, actually its cheaper to use. Synthetic doesnt cost twice as much as mineral oil, but you can go potentially twice the distance on it.
 

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its prob cause they want you to come change it our more often...resulting in more cash spent.

But synthetics are completely worth it.
x2... they want you in their shop every few thousand miles so they make more money off of you. Either that or they're VERY old fashioned and think this new "snake oil" stuff is a fad or something :rof
 

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First off....I use synthetics in my DMAX and my boat. With that said my Freightliner has over a 1,000,000 miles on the original engine on regular oil. I've had numerous vehicles that I've driven over 250,000 miles on regular oil without a problem, but I did change my oil at recommended levels. Do I think synthetics are better...Yes I use my DMAX mostly for towing my boat or toyhauler. I still change my oil at 7500 miles using synthetics, but at the most I drive 15,000 miles per year. Just my 2 cents...
 

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Its just a worktruck
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Smart Dealer. I would listen.
 

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i ran regular rotella in my last truck, (2002 d-max) and had over 200,000 on it and never had any problems other than the injectors. that being said, i'm running AMSOIl in the current truck. we'll see how this one lasts.
 

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Went to syn at 65k,glad I did also..I can go 10-12k on the oil and the DIC[which I don't go by]says it always has 30% left on it.....I use Mobil 1 5-40 full syn Turbo Diesel Truck,and their filters as well..........06 LBZ 173,538 miles,5674 hrs. on engine and counting.....
 

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How well do the synthetics work in gas burners?

ALB
 

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How well do the synthetics work in gas burners?

ALB
They work equally well, and you will see the same benefits from it. :drink
 

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My dealer told me i had to run synthetic in my 09 LMM
 

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i run amsoil in my truck, two weeks ago i took a 3100 mile road trip to vegas and back, my oil still looks as good as when i changed it. this is the first time i've ever run syn oil. i'm sold on it now, yesterday i changed oil on my gasser, and i put syn oil in it, truck has 180,000 miles on it.
 

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still not sure if i want to change to syn in the duramax...i have to run syn in my c5 vette......
 

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still not sure if i want to change to syn in the duramax...i have to run syn in my c5 vette......
if you tow, the reason you NEED to use syn is the same exact reason your car needs it. A little known fact about your vette is that GM goofed in not providing adequate oil cooling, so it gets very hot, well above intended spec. Instead of fixing the problem, GM decided to spin "high performance oil for your high performance car"..."nothing but the best will do" kind of marketing to appeal to ego, instead of admitting a failure.

The 05 dmax has had oil temp logged over 350F. This renders lubricity to moderately better than cold water. Under this thermal stress, dino oil breaks down handily and oxidizes quickly. Synthetic deals with that environment much better, hence my suggestion.

If used as a grocery getter, the argument is mute. Sustained high loads, you have an oil temp problem to just be aware of. Especially in hot weather, and high mountain pulling.
 

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Is there a certain milage that you don't want to switch over to synthetic?

I was reading somewhere on here that after a certain amount of miles (on the higher side) that you don't want to switch over to synthetic cause it can loosen all stuff up thats been collecting in your motor.... i'll try to find the topic on here, I have just turned 100k on my 05 dmax and wouldn't mind switching over to Syn. as long as i'm not causing problems.

Ps. Is that purple synthetic oil any good??
 

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My dealer told me i had to run synthetic in my 09 LMM
They prefer you do due to the low-ash characteristics it has I would say...

For switching to synthetics or noT^^^^:If you have gone to 150k or so do you NEED to switch.....NO.............You may want to,but there is no NEED after that much mileage,I drive sometimes 13 hrs. a day,so I LIKE my synthetic motor oil..
 
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