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  #1  
Old 02-17-2018, 10:38 PM
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Engine Oil

On many forums there are people saying you should use synthetic oil in your classic, while others say to use conventional, and diesel oil. What are your guys' thoughts on Oil? I am about to do my first oil change.
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Old 02-18-2018, 07:29 AM
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Choice of oil is more religion than science. You will get no useful responses.
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Old 02-18-2018, 02:13 PM
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X2, other than todays conventional oil should be superior to the oils sold say thirty years ago. That and less expensive than todays full synthetic.
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Old 02-19-2018, 02:58 PM
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If you want to find all the oil leaks in an older motor, use synthetic. I agree with rocky raccoon.
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Old 02-19-2018, 07:22 PM
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Originally Posted by 280EZRider View Post
If you want to find all the oil leaks in an older motor, use synthetic. I agree with rocky raccoon.

LOL. This is such a true statement.
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Old 02-20-2018, 03:42 PM
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The main thing to look out for is using zinc on these because of the cam and rocker style.
https://www.amsoil.com/newsstand/classic-and-vintage/articles/flat-tappet-cams-in-classic-cars/

I am not going to go out and suggest any particular type - buy the best you can afford is my motto, and change it based on your driving habits. But just make sure it has zinc.
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Old 02-21-2018, 02:20 PM
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Originally Posted by Tomas7 View Post
LOL. This is such a true statement.

Is it? I've been using a 15W40 para synthetic for years and find no particular problems with oil leaks.
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Old 02-21-2018, 05:50 PM
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I personally use conventional 20W-50 oil.
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Old 02-21-2018, 06:01 PM
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In the SD I use a lighter weight conventional oil in the winter; helps it to spin better when starting if it is cold.
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Old 02-21-2018, 07:27 PM
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Originally Posted by Benz Dr. View Post
Is it? I've been using a 15W40 para synthetic for years and find no particular problems with oil leaks.
I could very well be wrong. I've been wrong many times before.
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Old 02-22-2018, 11:38 AM
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I've been using some sort of synthetic since 1982 which is long before most people were even aware of it. I've found that a tight non leaking engine won't leak with synthetic and an engine that leaks with regular oil will also leak with synthetic. Oil type proves nothing except that leaky engines leak oil.
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Old 02-22-2018, 11:41 AM
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Part of the issue is actually how well synthetic cleans... so it'll clean the gunk off the outside of your engine that built up from leaking conventional.
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Old 02-22-2018, 01:09 PM
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Just observe the second number in the weight the car calls for and you will be fine.

I think a lot of people like to blame their lack of desire to change a front main seal on their one time usage of synthetic oil.
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Old 02-22-2018, 02:46 PM
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Originally Posted by Tomguy View Post
Part of the issue is actually how well synthetic cleans... so it'll clean the gunk off the outside of your engine that built up from leaking conventional.

The detergent package in any oil isn't like a bar of soap where it will clean all of the grease and dirt from your hands. In this case it will only clean what's loose inside your engine and if everything is baked on old crud it won't touch it at all.

Synthetics hold dirt in suspension much better than regular oil and will keep your engine clean inside even over long change intervals. I've been using various brands of synthetic in my farm equipment for the past 30 years and I've never had an engine failure. My 230SL has run synthetic in all applications for the same 30 years and it runs great.

Your mileage may vary.
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Old 02-22-2018, 03:36 PM
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After buying a new head from them Metric Motors advised me to use Castrol GTX. It was cheaper then Delo, so I followed their advice.
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