If you take that truck out if frigid winter temps, a syn is a good idea. I'd buy a good one, not a cheapo (there is a difference in synthetic oil quality). The 3 or 4 year oil drains with syn would be OK, or 2 years with conventional. You're burning or leaking some, and the oil you add replenishes the additive package in the oil. Or, just any good brand conventional 5W-30 and a good filter, your yearly oil changes, and you have peace of mind.
Would syn be good for truck that sits a lot?
- Thread starter Chris B.
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Originally Posted By: dave1251
The use of synthetics will likely increase the iron count in a UOA that is nearly worthless in determining engine wear.
I personally would not bother. Just buy whatever you can get for the least amount of money. The oil will not cause the engine to fail.
For a truck that is about to enter her second decade she looks excellent I dare to say new! You have replaced the intake and head gaskets?
Why do you say Synthetic would increase iron?
The use of synthetics will likely increase the iron count in a UOA that is nearly worthless in determining engine wear.
I personally would not bother. Just buy whatever you can get for the least amount of money. The oil will not cause the engine to fail.
For a truck that is about to enter her second decade she looks excellent I dare to say new! You have replaced the intake and head gaskets?
Why do you say Synthetic would increase iron?
Originally Posted By: Chris B.
Originally Posted By: dave1251
The use of synthetics will likely increase the iron count in a UOA that is nearly worthless in determining engine wear.
I personally would not bother. Just buy whatever you can get for the least amount of money. The oil will not cause the engine to fail.
For a truck that is about to enter her second decade she looks excellent I dare to say new! You have replaced the intake and head gaskets?
Why do you say Synthetic would increase iron?
Originally Posted By: dave1251
The use of synthetics will likely increase the iron count in a UOA that is nearly worthless in determining engine wear.
I personally would not bother. Just buy whatever you can get for the least amount of money. The oil will not cause the engine to fail.
For a truck that is about to enter her second decade she looks excellent I dare to say new! You have replaced the intake and head gaskets?
Why do you say Synthetic would increase iron?
For a truck that is that old & use I would use Walmart SuperTech Synthetic 5W-30 & call it a day!
wemay
Site Donor 2023
Originally Posted By: Chris B.
Is PYB better then Castrol GTX? My last Tahoe on GTX with the 5.7 liter had the lowest wearing 350 on file with Blackstone Labs. This Sierra has yet to show a UOA as good as my 1997 Tahoe did also.
GTX, PYB or any other SN/GF-5 approved conventional, you'll be more than fine.
Is PYB better then Castrol GTX? My last Tahoe on GTX with the 5.7 liter had the lowest wearing 350 on file with Blackstone Labs. This Sierra has yet to show a UOA as good as my 1997 Tahoe did also.
GTX, PYB or any other SN/GF-5 approved conventional, you'll be more than fine.
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wemay
Site Donor 2023
Originally Posted By: raytseng
The question is, will it do harm? answer: no.
Your tires, other fluids, and rest of the car are also depreciating just sitting around too; so spending $20 more for synthetic is the least of your costs.
...or concerns.
The question is, will it do harm? answer: no.
Your tires, other fluids, and rest of the car are also depreciating just sitting around too; so spending $20 more for synthetic is the least of your costs.
...or concerns.
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Originally Posted By: wemay
Originally Posted By: raytseng
The question is, will it do harm? answer: no.
Your tires, other fluids, and rest of the car are also depreciating just sitting around too; so spending $20 more for synthetic is the least of your costs.
...or concerns.
Yes...coolant, power steering fluid, brake fluid, AT fluid etc...all degrade over time....
Not running the engine often, and then running it up to full operating temp, should justify using ANY SN oil in the weight range spec'd for you truck...for 2 years....but changing it once a year will satisfy any itch/discomfort you, if not your engine, is experiencing mid-slumber.
...but I'd also like to mention...anything rubber will degrade over time more than over mileage....belts, hoses, gaskets, engine mounts...keep an eye on them.
Originally Posted By: raytseng
The question is, will it do harm? answer: no.
Your tires, other fluids, and rest of the car are also depreciating just sitting around too; so spending $20 more for synthetic is the least of your costs.
...or concerns.
Yes...coolant, power steering fluid, brake fluid, AT fluid etc...all degrade over time....
Not running the engine often, and then running it up to full operating temp, should justify using ANY SN oil in the weight range spec'd for you truck...for 2 years....but changing it once a year will satisfy any itch/discomfort you, if not your engine, is experiencing mid-slumber.
...but I'd also like to mention...anything rubber will degrade over time more than over mileage....belts, hoses, gaskets, engine mounts...keep an eye on them.
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