Syntechtic Oil In Old Engine???

[90celica]

SYNTECHTIC OIL IN OLD ENGINE???

I have a 5sfe engine with 345,000kms on it. Would it be harmful to start using SYNTECHTIC OIL???

Thanks

Dale
hottip1@hotmail.com

[Deep]

It may uncover some leaks, which the 5sfe is prone to get over age, that could be said of most engines though.

[amerikim]

Some gradually phase in synthetics by mixing with regular, I personally won't because of all that crap I read about oil seperation when I was digging on additives. I would recommend a flush before going syn as well as filter after. Also plan your first oil change after going syn earlier and changing filter again. That is of course, imho.

[Kidane]

Switched to Mobil One synthetic blend high mileage formula on my 4AFE at 133,600 miles. Changed the oil again at 136,150. I'm at 136,500 now, not a drop has leaked out.

Personally, I wouldn't recommend a full synthetic, use one of the "high mileage" synthetic blends that many oil manufacturers have. Last time I changed my oil it came out clear, looked almost new. Another nice thing is the extended change interval, I think it's roughly 7,000 miles on synthetic. I still change mine every 3,000 because I'm neurotic though.

[Pineapple]

Syn oil create less build up and clean out old ones. So old engine may burn/leak oil. If the engine burn/leak too much, mix it with regular oil.

[Hambone]

I take it your a fellow canuck! I bought mine with 172000kms on it and switched to Mobil 1 right away and sure enough I got some smoke on start-up. I switched back to just good ole' 10w30 and the smoke went away. 208kms now and still rockin'. How does yours run, original tranny???
l8r

[90celica]

my car has original everything ..... tranny and engine, new clutch and new seals on the engines