oil question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

truckguy_69 · 10-04-2007, 06:30 PM

i have an all stock 307 in 69 and its got 129000 miles and im runing castrol 5w30 highmilage oil. i was wondering is this the right oil for my truck?

68 P.O.S. · 10-04-2007, 06:45 PM

I know myself and a lot of others use 20W50.

68gmsee · 10-04-2007, 06:55 PM

Check your oil consumption. If it's not using a lot of oil after your regular oil change, then you're not hurting anything. However, it's a little on the lite side for summer or warm weather use on a high mileage vehicle.

With that many miles I would stick to a straight 30 weight or heavier in summer and then switch to the lighter 10/30 or there abouts for the winter.
It's a matter of knowing what your motor wants or will operate better with.

**WorkinLonghorn** · 10-04-2007, 07:05 PM

I don't know what part of Washington you are in but if you are in the colder regions that would be OK for winter use.Frankly though I'd go with 10-30,or 10-40. Here in So.Cal.we have such mild winters,I just use 10-30 Mobil-1 all year. With a high mileage engine or when I expect to do a lot of desert driving (120+) I tend to go thicker and use 20-50 (Castrol).

truckguy_69 · 10-04-2007, 07:10 PM

i live in the dessert area (eastern/central part) of washington i ran 5w30 all summer

so if i run to 10W40 or 20w50 before winter hits that would be a good idea.

**WorkinLonghorn** · 10-04-2007, 11:55 PM

Here's what my origional owner's manual says;

truckguy_69 · 10-05-2007, 11:25 AM

ive also got the original owners manual for my truck but never looked in it for the right oil.

10-04-2007, 06:30 PM	#1
truckguy_69 Registered User Join Date: Apr 2007 Location: washington Posts: 95	oil question i have an all stock 307 in 69 and its got 129000 miles and im runing castrol 5w30 highmilage oil. i was wondering is this the right oil for my truck?

10-04-2007, 06:45 PM	#2
68 P.O.S. Registered User Join Date: Jan 2007 Location: Puyallup, WA Posts: 1,662	Re: oil question I know myself and a lot of others use 20W50. __________________ 72 C10 lwb fleetside -stock 350/350 combo

10-04-2007, 06:55 PM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: oil question Check your oil consumption. If it's not using a lot of oil after your regular oil change, then you're not hurting anything. However, it's a little on the lite side for summer or warm weather use on a high mileage vehicle. With that many miles I would stick to a straight 30 weight or heavier in summer and then switch to the lighter 10/30 or there abouts for the winter. It's a matter of knowing what your motor wants or will operate better with.

10-04-2007, 07:05 PM	#4
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,883	Re: oil question I don't know what part of Washington you are in but if you are in the colder regions that would be OK for winter use.Frankly though I'd go with 10-30,or 10-40. Here in So.Cal.we have such mild winters,I just use 10-30 Mobil-1 all year. With a high mileage engine or when I expect to do a lot of desert driving (120+) I tend to go thicker and use 20-50 (Castrol). __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

10-04-2007, 07:10 PM	#5
truckguy_69 Registered User Join Date: Apr 2007 Location: washington Posts: 95	Re: oil question i live in the dessert area (eastern/central part) of washington i ran 5w30 all summer so if i run to 10W40 or 20w50 before winter hits that would be a good idea. Last edited by truckguy_69; 10-04-2007 at 07:11 PM.

10-04-2007, 11:55 PM	#6
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,883	Re: oil question Here's what my origional owner's manual says; __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, stereo speakers, 2nd owner, Work-Truck supreme.

10-05-2007, 11:25 AM	#7
truckguy_69 Registered User Join Date: Apr 2007 Location: washington Posts: 95	Re: oil question ive also got the original owners manual for my truck but never looked in it for the right oil.



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