1980 300TD buying ?s & oil preasure concerns.
I am looking at a 1980 300TD wagon tomorrow. 178K miles non-turbo 617.
My concerns: This car was passed over by another potential buyer because of the oil pressure. I asked the owner to start the car. At warm idle oil pressure was 1.5. I asked him to rev it to 2k rpm and he stated it read 2.5. Is this something I should be concerned with or is this normal? I will of course check for blow-by. I am also concerned when the owner mentioned that in the back of the car is a empty oil container by Quaker State that read 10w-40. This car belonged to his father who he said was a Mercedes enthusiast. This does not seem to be a diesel motor oil. I am hoping it was just back there to throw away and not used in the car. However if this car was run on non-diesel oil what should i look for besides blow-by? |
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I am wondering if the wrong oil was used that might explain the low lower oil pressure at higher rpm.
I am really hoping this engine is ok. It has been a long hard search for one of these cars for me but I don't want to buy a money pit. |
Wrong oil or a weak pressure relief valve would be my guess.
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Incorrect or defective oil filter can cause low oil pressure. Best to avoid the filters made in India.
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I wish you good luck in finding a nice 617 powered TD, a large % of drivers swear by QS oil, the rest of us swear AT it... 10/40 oil was all you could get in the old days. qs is a good brand, I am sure it has at least CF rating, so as long as decent OCI was followed, that should not be the problem. the 123 oil pressure gauge is real, not sender, so that's not it. if it won't reach 3, as mentioned it could be a lousy filter, or it could be several other things. you may want to have the seller change the oil and filter and see where the op sits. if it was recently changed... walk away.
as a driver of a N/A TD, you may want to hold out for a turbo model anyway. PNW is a lousy place to find them for good prices in good shape, but I am sure you will. I have 4... sorry we are so far apart... none of mine are cherry, but they were all affordable. check the Craigslists, check ebay, look around. you will find the one you want. |
On the turbo charged cars it needs to be 3 bar by 3k rpm.
Its a very old engine, with a very old guage. As long as it hits 3 bar at 3k drive it. Put some tape over it, if it bothers you! |
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IMO, the more important thing is how often the oil was changed. Also, I love driving my N/A 1980 300TD. This car has lots of pep and actually feels lighter than the turbos for some reason.
178k is low for this car, IMO. If the body is in good shape and the price is right, I'd seriously consider it. Of course you gotta look at the condition of other things (vacuum, exhaust, suspension (sls?), flex discs, axle boots, tranny, etc). |
You're missing something here. 1980 wagons didn't have a tachometer. There was no way for him to find out if it's actually the RPM you wanted.
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I truly love driving my 79 TD, due to it's spunky stop and go abilities. but on the highway the SD is kinda nice. I can't wait for my 85 Euro TD to get finished, so I can see how it is to drive.
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