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1990 740 Turbo sedan[ALL/1998] posted by Bill Russell on
Saturday, 30 August 1997, at 6:47 p.m.
Hi. I'm new to Volvos; mine has 122k miles, with a new(ish) turbo. I get the idea that these are rather special cars wanting that kind of attention. The turbo part has me a bit perplexed; what's the deal with warming up and cooling down?. Someone told me that even oil changes should not be done by the likes of (don't gag) Jiffy Lube. What should I read? What must I know? Any help is greatly appreciated. By the way, i think i'm a convert already... thanks
Re: 1990 740 Turbo sedan[ALL/1998] posted by Henry T. Mui. on
Sunday, 31 August 1997, at 1:43 a.m.
Bill,
all turbocharged cars heavily rely on lubrication ans cooling. all Vovo turbs have a forced lubrication system that is designed to keep the turbo's bearings well-oiled while the engine is running. In the later volvo mturbo models, water cooleing is used to maintain an even and moderate temperature in critical areas of the turbo housing. In both cases the oil and coolent are supplied from the
engine's lubricating & cooling systems and therefor, greater than normal demands are placed on these fluids. When the engine is shut off, however, so is the supply of oil and coolent. Still some heat transfer does happen after the shut down, in many cases this is not enough to ensure adequate protection. The problem is that the turbo continues to spin for servral minutes after shut down.
If your car has been driven hard or aggressive, the components are extremely hot. When you shut-down, the cessation of oil and coolent causes the temperature
in the turbo housing to increase. This will cause the oil remaining around the bearings to cook and turn into carbon. This leads to expensive turbo repairs.
That is why you need to check the coolent, air filtration,lubrication and any
oil spots on the gound where you park for signs of oil leakage!
Live long --- Drive long,
Drive Volvos.
Re: 1990 740 Turbo sedan[ALL/1998] posted by Kevin Roybal on
Monday, 1 September 1997, at 4:51 p.m.
I drive an 87 turbo 740. You might want to check your owners manual about this, but I think the engine takes more than four quarts after an oil change. It is something like four and a half. I think it is because the turbo needs extra oil or something. Like I said you might want to read your owners manual about that. Also you must let your engine run about thirty seconds before you turn it off. This helps slow down the turbo and prevents meltdown. NEVER rev your engine before you turn off the car. That would be very bad for the turbo. Good luck with your car. Mine just turned 100 thousand, and is doing great. I wish you the same luck with yours!
Old Volvos never die,
They just get faster!
Re: 1990 740 Turbo sedan[ALL/1998] posted by Ray Hartle on
Thursday, 4 September 1997, at 10:18 p.m.
Bill,
Just stumbled accross your message while doing a little surfing.
Like Kevin, I have a '87 740 turbo sedan which is just about to turn 100k. He is correct about needing more than 4 quarts of oil but only if you drain the external oil cooler. This is not usually done, therefore 4 quarts will get you up to the full mark.
I bought mine new and after 6k miles I've only used Amsoil synthetic turbo oil and the Amsoil oil filter designed for synthetics. I get 24 mpg and it doesnt burn a drop of oil. And yes I can still fry the tires whenever I want!
One of the main reasons I use Amsoil is to protect the turbo. The sythetic oil doesn't break down or coke over when exposed to extreme heat and has lubricating qualities that petroleum based oils just can't match. The Amsoil oil filter removes particles down to 4 microns or so which is about 5 times beter than the average paper filter.
I would highly recommend using sythetic oil in your Volvo to add life to the turbo and the rest of the engine for that matter. Also, you won't have to worry about letting the turbo cool down before shutting down the engine.
Feel free to contact me if you want more info about synthetic oil.
Ray Hartle
Beaver, PA