Synthetics
Safety Car
Joined: Jan 2004
Posts: 3,783
Likes: 15
From: Northern California
My 91 daily driven Vette, has had Full Synthetic fluids (oil, trans, rear diff and brake fluid), since 50,000 miles and now has 142,000 with no problems!...
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Last edited by GKK; Jun 17, 2014 at 10:07 AM.
Drifting
Joined: May 2007
Posts: 1,552
Likes: 324
From: Mid Ohio
for many yrs and on many cars I've used both kinds. What I've settled into to M1 for oil and regular oils for everything else because I believe in changing fluids to get the debris out and to have a chance to see the state of the union so to speak.
Yeah synthetics might have less friction and can last longer.. but the cost usually is more than just changing the fluids at regular intervals. For all fluids I just use the cheap stuff from W-M and change it every 1-2yrs. (PS,tranny,coolant,brake,rr end)
My one exception is M1 for engine oil. I've personally rebuilt engines that used it and have never once seen coked oil in hot areas like lifters or sludge in the pan or heads. That stuff is pretty good considering the price in my book. (I've found it to be cheapest at costco in boxes w/two 5qt jugs)
Yeah synthetics might have less friction and can last longer.. but the cost usually is more than just changing the fluids at regular intervals. For all fluids I just use the cheap stuff from W-M and change it every 1-2yrs. (PS,tranny,coolant,brake,rr end)
My one exception is M1 for engine oil. I've personally rebuilt engines that used it and have never once seen coked oil in hot areas like lifters or sludge in the pan or heads. That stuff is pretty good considering the price in my book. (I've found it to be cheapest at costco in boxes w/two 5qt jugs)
Last edited by wydopnthrtl; Jun 16, 2014 at 11:17 PM.
Le Mans Master
Joined: Oct 2004
Posts: 6,314
Likes: 508
From: South-central Missouri
My only concern would be the seals of older motors were aided by additives in dino oils to prolong their life. One of the early complaints of synthetic oils was the seals of some motors would begin leaking where they didn't in the past.
I read in some advertisements for various synthetic oils that additives are specifically included to address the issue.
Other than that, the advantages of temperature stability, especially in cold (winter) conditions and to lesser extend HOT as well (the reason synthetic oil (M1) was called for in 92 with the intro of the LT1 and the deletion of the oil cooler), synthetics have some definite advantages.
JMO
I read in some advertisements for various synthetic oils that additives are specifically included to address the issue.
Other than that, the advantages of temperature stability, especially in cold (winter) conditions and to lesser extend HOT as well (the reason synthetic oil (M1) was called for in 92 with the intro of the LT1 and the deletion of the oil cooler), synthetics have some definite advantages.
JMO
