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Re: oil weight reccomindations for 77 tradesman 360
lurksman200 #647106 December 30th 2013 11:38 pm
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Only downside to synthetic is if you've already got leaks in the motor it will only make those leaks worse. The original rubbers and gaskets were not made to handle synthetics so once the conventional oil is drawn out they start to tighten and "dry rot" so to speak. My van leaks quite a bit more since I've started synthetics so eventually i will need all new gaskets. Otherwise I love the performance I've gained. If you go with synthetics go with a straight 30 weight SAE30 or whatever your motor recommends. usually 5-30 or 10-30.


Gone vannin' I'll call you later.
Re: oil weight reccomindations for 77 tradesman 360
aftoyboy #647111 December 31st 2013 1:01 am
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Moving to synthetics shouldn't cause it to leak any worse. It might have seemed so for a few people, but there isn't anything chemically to cause it to leak faster or cause the seal to dry. I will look into the SAE library for any research tech papers testing this. I used to be a big conventional oil guy, valvoline, and I still am convention oil person (totally against synthetic oil). But, I realized the need for synthetics, especially on engines that tend to run hot and for vehicles that are under high load, such as our vans. The oil gets hot, the engine gets very hot, and the oil bakes.

But like I said, I will look into the SAE library.


Last edited by RamVan2500; December 31st 2013 1:04 am.
Re: oil weight reccomindations for 77 tradesman 360
lurksman200 #647119 December 31st 2013 3:45 am
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Like I said, I'm pleased with the added performance, lower emissions and lower temps. Only thing i don't do synthetic in is the diff. I haven't really dug deep for the reason why but I trust my old man with his advice for the most part. Plus I don't feel like swapping out another axle... Yet.


Gone vannin' I'll call you later.
Re: oil weight reccomindations for 77 tradesman 360
aftoyboy #647137 December 31st 2013 4:37 pm
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Well, to each his own. You should overhaul your engine. It doesn't cost much, about 300 bucks. Then you can run synthetic laugh

Re: oil weight reccomindations for 77 tradesman 360
lurksman200 #647872 January 07th 2014 1:51 pm
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I always used straight 30 or 20-50 in my 360's. Had one in my 85 Ramcharger that had over 500k miles on it when I pulled it to do some performance machining. Didn't need it, just wanted more power.


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Re: oil weight reccomindations for 77 tradesman 360
lurksman200 #671979 October 04th 2014 11:24 am
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What about a good ZDDP additive for our older flat tappet cam motors? Much less zinc in the new oils I understand which makes these additives a good idea?


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Re: oil weight reccomindations for 77 tradesman 360
lurksman200 #671980 October 04th 2014 11:53 am
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ZDDP is unnecessary. The modern oils are formulated to be backwards compatible and you will be fine. Use a good 5W-30, synthetic if you can afford it.


Windows- they're what make a van worth owning!
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