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post #1 of 5 (permalink) Old 09-11-2011, 06:15 PM Thread Starter
 
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1996 B3000: 10W30 vs 5W30 oil for winter?

For the past two winters, my 1996 Mazda B3000 4x2 truck has been parked. However, I am considering using it on a part time basis this winter.

Currently, it has 10W30 oil (change done around May 2011). Normally, I would use 5W30 oil...in the recent past, I have had an ongoing minor oil leak...apparently stopped leaking oil after I switched to 10W30. My mechanic told me that he would have to drop the oil pan in order to fix the oil leak. I didn't want spend very much $$$ on an older truck....and therefore, left it as is.

Winters usually go down to as cold as minus 40 deg C (in the long past was reported to go down to minus 50). Long stretches down to minus 25 to minus 30. Usually only a few days to a week below minus 30.

Recommendations?

If it's too cold, snowy or icy, I can use my Ranger 4x4 instead. Cutoff temp for the Mazda...minus 20 deg C?

BTW, I have a new battery this spring.

Dave

2010 Ford Ranger FX4
Armaguard sprayed on bed liner
Truxedo Low Pro QT tonneau cover
Studded General Altimax Arctic P245/75-16 winter tires on black steelies
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post #2 of 5 (permalink) Old 09-11-2011, 07:30 PM
 
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5W30 is a good idea when it's that cold for sure. If you can afford it, synthetic oil is even better in the extreme cold (especially when starting the truck) as it will flow much better than conventional oil.


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post #3 of 5 (permalink) Old 09-12-2011, 11:33 PM Thread Starter
 
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Thanks, but I have decided to stick with conventional oil...read good things about Valvoline Maxlife Higher Mileage oil 5W30 or 10W30 (helps out on leaks too) on my next oil change. A block heater and smart trickle charger will help me as well.

Dave

2010 Ford Ranger FX4
Armaguard sprayed on bed liner
Truxedo Low Pro QT tonneau cover
Studded General Altimax Arctic P245/75-16 winter tires on black steelies
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post #4 of 5 (permalink) Old 09-13-2011, 04:04 AM
 
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Just thought I'd add my 2 cents. I've had some experience with very cold climate in Fort St. John. I think you're on the right track with the block heater -- that's key.

The issue is the oil gets more viscous when it's cold, making for harder starting. Once the engine gets up to normal temperature, then the oil is going to do what it's going to do. Using a block heater, you're going to be okay with 10W30, IMHO. When the engine is up to temperature, it doesn't matter what the outside air temperature is.

Re: leak.
Have you tried any oil additives, specifically the ones designed to fix leaking seals, etc.? I've had good results in the past, after having that option reccommended by an experienced mechanic. I think the one I used on my old Nissan truck was from Bardahl. I just used one treatment, and it seemed to fix a fairly small leak from my rear crankshaft seal permanently. Never saw another drop of oil come out of it for the years I drove that truck afterwards, and it didn't seem to have any negative effects on the engine. I think those additives work by swelling soft items like gaskets, seals, and o-rings, that harden-up and shrink with age.

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post #5 of 5 (permalink) Old 10-04-2011, 06:24 AM
 
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A good high mileage 5W30(Mobil Super, Castrol, ETC) sounds like it's exactly what you need. HM oils are designed to stop small seal leaks and 5W30 is thin get it where it needs to be when cold.

2009 Ranger Sport 2WD 4.0L/3.55:1/5spd Bone Stock.
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