need advice on high mileage oil - Ford Mustang Forum

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post #1 of 8 (permalink) Old 05-20-2002 Thread Starter
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Question need advice on high mileage oil

Ok I have a 88 GT with 110,000 miles. I have only had car for 4 weeks. I put Maxlife in on the first oil change. I was thinking about using mobil 1 or mobil higher-mileage SuperSyn Fully Synthetic Motor Oil, but the car has used a quart in 2000 miles. I can see a little light gray smoke if I am behind the car and someone is getting hard on it. It also has a leak around one of the valves covers. It leaves about a haft dollar sizes spill each time the car is parked. Will the synthetic leak more then regular and burn more, should I stay with the regular?

2003 Mustang GT 3.73, Kenne Bell 2.1 Intercooler @ 10lbs 90mm MAF, 75mm TB, cold air kit, switch chip. 426 rwhp, 446 rwtq in shoot out mode,MMS caster camber plates, lower control arms and SFC
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post #2 of 8 (permalink) Old 05-20-2002
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I put max life on my 88 gt with 122k miles on stopped almost all of the leaks like it said it would. I was leaking from the front side of the oil pan. I myself am very pleased with it. Synthetic won't do much for you in terms of leaks, neither improve or worsen the situation. Unless your mustang lives the life of a dog, stick with the regular.

88 Mustang GT
engine - bone stock (so far)
interior - replaced all mising parts, 86 headrests. Kenwood sound system, Kenwood 600 watt amp, RF 12" sub.
Misc - Viper alarm system, Window Tint
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post #3 of 8 (permalink) Old 05-20-2002
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I had Mobil 1 10w30 in my old motor and it came out of every gasket possible. I switched to Mobil 1 15w50 and that worked great. I had a really high mile motor that I put 200 shot of nitrous to and it worked great. I would highly recommed the 15w50 for a high mile engine.

1980 Mustang Cobra Carb'd and Juiced 306 AFR 185's Dynamic C4
10.83 @ 124 w/ NOS
11.86 @ 113 n/a
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post #4 of 8 (permalink) Old 08-24-2002
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get the leak fixed then start running a high quality synthetic like Amsoil. You dont wanna be putting a more expensive oil in often if you are experiencing burnoff and leaks.

Emery Layton

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post #5 of 8 (permalink) Old 08-25-2002
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Yeah I don't think it would make much sense to put in high quality oil when you're burning or leaking oil. Fix the leak then run good oil. Good way to save your money.

89 GT Convertible 306, Port Polished GT40 Aluminum Heads,Self polished GT40 Upper and lower Intake, 30 lbs injectors, carter intank fuel pump, bosch piggyback inline fuel pump, Intercooled Procharger, Southside lower rear control arms, suspension technik lowering springs, tokico rear shocks, 4:11 gears, aluminum driveshaft, weld in subframe connectors
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post #6 of 8 (permalink) Old 09-04-2002
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I know this is kinda off the subject but, does anybody recommend Prolong in their engines and trannies? I use Valvoline synthetic in my engine and Mobil 1 ATF in my T 5.

1992 LX 5.0, 12 inch K & N cone, SLP Loud Mouth dumps (for 98 and up Cobra), home made cold air box, underdrive pulleys, 75mm chrome Pro M MAF, bypassed airpump with short belt, Jeg's Universal Ford 2 row aluminum radiator, 16 inch electric fan, E cam, SVO 1.6 roller rockers, weld in subframe connectors, 16 degree timing, short throw shifter, Hotchkiss tubular UCAs and LCAs, Maxspeed springs, aluminum drive shaft,shorty headers, and BBK adjustable fuel pressure regulator, 3.73gears
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post #7 of 8 (permalink) Old 09-04-2002
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I have never used Prolong but as far as adding additives to synthetic products, my understanding is it is not recommended practice.

Scott Halliday
1992 Red 347 Automatic Limited Edition Convertible
1991 Red 5.0L 5-Speed Hatchback
1989 Black 5.0L 5-Speed Coupe
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post #8 of 8 (permalink) Old 09-04-2002
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Get your leaks fixed. I have a engineer friend who has done numerous studies on oil and it is proven that regular oil is as good as sythetic if it is changed every 3k miles.

The GT is gone.....The Cobra will come next!!!
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