North American Turbocoupe Organization

Synthetic in an old car?
WyldeSoul Offline
I've heard many times before that you don't want to use synthetic oil in a car that has been using regular it's whole life.

This true?

I want to switch to synthetic, but I've got a 200,000+ motor that has never had it.
The Wench 1987 Turbocoupe. 5 speed. Black with Raven/Charcoal interior. Beater.
Mods: Cone filter, manual 2 stage boost controller (Gillis style), Thrush Glasspack (Pre-axle dump.)

bhazard Offline
Posting Freak
Ive used synthetic in my car since I got it. It had 141k on it then and was neglected and beat to crap. No doubt it was run on cheap oil that was probably never changed.
88 TC, 170k, K&N, $5 Boostvalve, Stinger 3" ex., 3" Magnaflow, 3" Stinger tail, Zoom clutch
15.26 @ 86mph, 2.18 60' killed valvetrain & headgasket

AerobirdMotorsports Offline
I have Royal Purple in a 1959 Buick Electra, with it's original motor. No problems, no leaks.

Robert Camp Offline
Posting Freak
Synthetic is generally recommended for "high" mileage engines. With the modern synthetics there shouldn't be any problems, except the engine may last longer than you want it to.
Robert Camp
'86 Medium Regatta Blue TC, 5-speed, original owner.

86XR7auto Offline
The only problem with using synthetics on a old engine, is oil leaks. You may have lots of them or you may not.

Good luck

86XR7 in pieces...old time [email protected] 88TC stock Red RHSC [email protected], 01 Z71=Nice winter ride, 01 CVLX w/HPP wifes ride!

Gary F Offline
Senior Member
I used it for a few years without leaks, and every time I checked my oil I couldn't believe how clean it was. After I developed a leak (no fault of the oil) when the engine turned 200,000 miles, I went back to the regular stuff because I couldn't afford to add the 2 quarts of synthetic every week. There are synthetics and synthetic blends for high-mileage cars. Go for it.
Gary Fraser

I used to be normal...then I got a Turbo Coupe.
'88 T5 Bone Stock w/3G Alt.

Joe F Offline
Posting Freak
#7 - IMHO the best oil site on the web. Years of reading, every topic imaginable. Enjoy.
JR's Place - My '87 Turbocoupe

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