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oil/coolant question


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If you live where anti-freeze is required, 50/50 permanent anti-freeze of the etylene glycol type is typically used. If you live where no freezing temperatures are encountered, I'd use distilled water and one of the verious rust-inhibitor additives.

Lots of opinions on oil. Many of us use SAE20W-50 year-round, though the latest version (API CJ-4) is somewhat emaciated from the previous version due to the new catalytic converter requirements on trucks.

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If I lived in the Cold Cold North, like some of you do, with -30 deg temps, I think I'd be using 100% Antifreeze.

Luckily here in Texas, 'A little Dab 'el Do ya'.

Same goes for Oil, Straight 30 or 40W will do fine here, since I never drive them in below 50deg. weather, anyway. So It mainly depends on the climate where you live, for Both.

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Sorry, I meant SAE15-40, not 20-50 in my earlier response here (getting dislexic?), a really good year-round oil choice for most climates and yes, it also rated for light diesel eigine use. Mobil's Delvac is more or less equivalent to the Shell Rotella T. I use this in flat-tappet Packard but use Formula Shell SAE 30 in my roller tappet 34 Eight.

You can backflush thru the upper radiator hose (remove the thermostat) down into the head and out the lower radiator hose which you've already removed from the radiator tank. You can often find the flushing "guns" at flea markets that fit multiple size upper hoses and accept both water and compressed air inputs for the flush. It is also very important to remove the water distribution tube for cleaning.

Hey Speedster, be careful about using 100% antifreeze. If what you buy is already a packaged dilution with water, I'd agree but 100% ethylene glycol (the original Prestone type before they started selling premix) freezes at a higher temperature than the 50/50 mix, sort of like a liquid eutetic.

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<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Owen_Dyneto</div><div class="ubbcode-body"> 100% ethylene glycol freezes at a higher temperature than the 50/50 mix</div></div>

I was joking about the 100% antifreeze, but now that you mention it, Does 50/50 mix Actually keep it from freezing up when the temps get down close to -40 (minus 40), like it has recently in some areas of northern USA, and it's probably even Colder in Canada, where some of our forum members are. I have No experience with temps that Low, since it very seldom gets below +30 here anymore.

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Temperatures here on the north shore of Lake Superior occasionally get into the -40's. It's been around -25 during the nights here for the past week. I typically mix 60% antifreeze/40%water to get the fluid down to -60 protection. In the summer I switch to water and rust inhibitors.

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Uh-Oh, Does the 60-40 Mix of Dave's fit into Owen's 'Liquid eutetic theory'? If so, how high can you go on the Antifreeze percentage before it Stops Increasing the ability to Not freeze (starts raising the freeze point temp) ???

<span style="font-size: 14pt"> <span style="color: #33CC00"> *** </span> <span style="color: #FF6666"> <span style="font-family: 'Arial Black'"> ? How High Can You Go ? </span> </span> <span style="color: #33CC00"> *** </span> </span>

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