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Old 08-06-2018, 06:11 AM   #41
Whitewolf
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When I had my '11 Ram with a 5.7, I used Amsoil. I even installed a bypass system. Used the 25K oil and filters. Changed everything at 20K. Just cause.

Been using Amsoil since the '70's. First car to use it was a Honda CVCC. Had to adjust the lifters every 10K miles and was always amazed at how clean the valve train was.

Now in my Ram 6.7 Cummins. Oil, oil filter and both fuel filters are changed every 15K.
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Old 08-06-2018, 09:33 AM   #42
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So on my 2013 Ram Hemi 5.7, I ran synthetic for the first few years, than started running just regular oil after awhile. couldn't tell the difference, So now my 2016 says to run Synthetic, so I am, but just in camping season.. I run regular oil in the winter time, with a dash of Marvel Mystery Oil. learned of the mystery oil through some vintage Volkswagen folks..Really just run with what feels right to you..
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Old 08-06-2018, 10:16 AM   #43
fjr vfr
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You have an owners manual that spells out when to change the oil. You should read it and follow what it says. Anything else is opinions, some right some wrong. You can't go wrong following the owners manual. The engineers that designed the engine wrote the book. I would think they know something about the subject. IMHO
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Old 08-06-2018, 12:02 PM   #44
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I was told on the Corvette C3 forums that if you've been using regular oil on the older Corvettes and then switch to synthetic oil, never go back to regular oil as your engine will start leaking.

I don't know if that is a fact or not, but I never went back to regular oil. Used Mobil 1 synthetic oil for 8 years on this:
http://1-4u-computer-graphics.com/1977.htm
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Old 08-06-2018, 01:38 PM   #45
sourdough
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Quote:
Originally Posted by jack65 View Post
I was told on the Corvette C3 forums that if you've been using regular oil on the older Corvettes and then switch to synthetic oil, never go back to regular oil as your engine will start leaking.

I don't know if that is a fact or not, but I never went back to regular oil. Used Mobil 1 synthetic oil for 8 years on this:
http://1-4u-computer-graphics.com/1977.htm

Nice Vette Jack! That synthetic sure made the car look so much better!!
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Old 08-06-2018, 04:38 PM   #46
jack65
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Originally Posted by sourdough View Post
Nice Vette Jack! That synthetic sure made the car look so much better!!
LOL! Here are my other ones over the years:
http://1-4u-computer-graphics.com/jacks-vettes.htm
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