Synthetic Oil Question
#31
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Location: Bozeman, MT
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Opinions on what oil to use in Montana in the winter?
Seen temps in the -30 range a few times. But not always. Around 0 is quite common though.
Should I put the Mobil 5w40 Truck and SUV in next oil change?
Have Premium Blue 15w40 Valvoline in now. Only 35k on her.
Seen temps in the -30 range a few times. But not always. Around 0 is quite common though.
Should I put the Mobil 5w40 Truck and SUV in next oil change?
Have Premium Blue 15w40 Valvoline in now. Only 35k on her.
#33
Registered User
Originally posted by infidel
The only reason people can go with long change intervals with syn is if they use a bypass filter and replenish additives with makeup oil when changing filters.
I would imagine the same could be done with dino oil.
The only reason people can go with long change intervals with syn is if they use a bypass filter and replenish additives with makeup oil when changing filters.
I would imagine the same could be done with dino oil.
There are two reasons, IMO, why synthetics will go more miles than dyno...without changing filters & adding oil.
1-Ozidation -Dyno oil is much more prone to oxidation which will attack petroleum fluids and lead to thickening (viscosity increase) and deposit formations. Synthetics are, for the most part, impervious to oxidation brought on by heat, pressure, moisture, acids & metal catalysts.
2- Synthetic additive packages tend to be a higher quality level...to last longer and allow for longer change intervals. for example, Amsoil, Royal Purple, and a few others use a "harder" TBN additive, that depletes more slowly...allowing longer useful life.
I ran Delo 400, 15w-40 (IMO, the best dyno oil available today) for 7500 miles...and analysis showed TBN dropped from 12 to 6.9. Oil should be changed at 1/2 the starting TBN #.
I ran Amsoil 15w-40 for 10,000 miles. TBN only went from 12 to 8.4
RJ
#34
Registered User
Originally posted by GlennRMK
Opinions on what oil to use in Montana in the winter?
Seen temps in the -30 range a few times. But not always. Around 0 is quite common though.
Should I put the Mobil 5w40 Truck and SUV in next oil change?
Have Premium Blue 15w40 Valvoline in now. Only 35k on her.
Opinions on what oil to use in Montana in the winter?
Seen temps in the -30 range a few times. But not always. Around 0 is quite common though.
Should I put the Mobil 5w40 Truck and SUV in next oil change?
Have Premium Blue 15w40 Valvoline in now. Only 35k on her.
I'm in western Montana though, our below zero temps rarely last over a few days and it's not unusual to have periods of 50-60° for days at a time in the winter.
If my temps were similar to eastern MT I would most likely use a oil pan heater during the few below zero days just because our temps swing so much in the winter. If I couldn't plug in would use a 10w30.
I ran Amsoil 15w-40 for 10,000 miles. TBN only went from 12 to 8.4
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