View Poll Results: Full Synthetic is Best or not.
I believe full synthetic is better
19
86.36%
I think conventional or conventional/synthetic blend is best
3
13.64%
Voters: 22. You may not vote on this poll
Which is Better
Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
Likes: 237
From: NE Ohio
I run amsoil 5w-40 turbo diesel in my 86 460 with 140k on it. Leak is no more than using dino / blends. Used mobil 1 turbo for a while prior same experience with it. Maybe burned slightly more.
Seems like I'm using less oil now with amsoil. Not trying to sell it to anyone just my synthetic experience.
If seals are bad they will leak regardless of what you use. That's the sell with high mileage oils, they add seal conditioners to it to swell the seals/gaskets.
Seems like I'm using less oil now with amsoil. Not trying to sell it to anyone just my synthetic experience.
If seals are bad they will leak regardless of what you use. That's the sell with high mileage oils, they add seal conditioners to it to swell the seals/gaskets.
Fleet Mechanic
Joined: Nov 2015
Posts: 1,671
Likes: 672
From: DeMotte, IN
Can’t vote in the pole without some limits. I change my oil and filter every 10k. I use full synthetic for about 35 years doing this with no issues in all my vehicles. If I changed oil every 3k or 5k, I most likely would be using Dino or a synthetic blend.
I only started filling the filter a few years ago.
I only started filling the filter a few years ago.
FTE Community Team
Joined: Jan 2019
Posts: 10,745
Likes: 1,498
I use synthetic on everything except for older applications that call for non-detergent oil. I've seen a few leaks on older stuff get worse after switching to synthetic, but not the majority of them, and not so much worse that I can pin blame 100% on the synthetic. A 50 year old cork valve cover or a 30 year old glorified cardboard fuel pump gasket or a 40 year old oil pan gasket are probably getting tired anyways, so worth it to me to switch and know I'll probably be changing gaskets soon and get it over with.
I guess that means that synthetic oil helps me to procrastinate a little less.
I guess that means that synthetic oil helps me to procrastinate a little less.
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1999 - 2003 7.3L Power Stroke Diesel
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