Asked by Jun 10, 2017 at 11:21 PM about the Chevrolet C/K 2500

Question type: Maintenance & Repair

What weight of motor oil do I use for a 1977 c20. With a 454 motor

6 Answers


Depends on where you live ina colder or warmer climate and how many miles are on engine. But a good start would be in the 10w30 -15w40 range.

Best Answer Mark helpful

Thank You


If you missing oil faster than you like you could move up to a hight weight oil, I know that the 454 seems to consume oil no matter which weight oil is used even on very healthy motors. I do not think you need 20w50 though. But if its very healthy motor you can get away with 5w30 or lighter but watch the oil level and see if it want to turn dark too fast and keep it change before getting black. If your using thin oil and it turns dark fast or is being lost due to consumption try moving to heavier weight, and if using thicker oil and it turns dark too fast try lighter weight. Also on the 454 if you have not already or not a OEM cooler in radiator I advise using an external oil cooler.


Welcome, and a oil filter relocate adaptor would not hurt none to make it easier but is not a have to do thing but I have noticed that if its easy to do then it gets done more often. Sometimes they tend to run warm (those from the 70's). If yours does a high capacity radiator will cool things down.

1 of 1 people found this helpful.

Thanks again for all your info. very helpful.


10w30 in the cooler half of the year. 15w40 in warmer half of the year. If its not below zero but a few times a year. 15w40 is fine on healthy motor and 15w40 if it has many miles, and 20w50 if its smoking. Also if you have more cooler days where you live and a short spring & summer, 10w30 or in even colder climates 5w20. I think with the 454 consuming oil fast on its own the 0w oils will disappear too fast even though it will run fine with it if it does not show smoke out the tail pipe, it will disappear, meaning you will need to keep quarts of oil just to top off with on-hand over the normal amount you already need to top off with in-between oil changes.

Your Answer

C/K 2500

Looking for a Used C/K 2500 in your area?

CarGurus has 4 nationwide C/K 2500 listings and the tools to find you a great deal.

Postal Code:

Chevrolet C/K 2500 Experts

  • #1
  • #2
  • #3
    Andrew Olsen
View All

Related Models For Sale

Used Chevrolet Silverado 2500HD
10 Great Deals out of 1,250 listings starting at $4,995
Used Chevrolet Silverado 2500
4 Great Deals out of 6 listings starting at $5,490
Used Dodge Ram 2500
6 Great Deals out of 89 listings starting at $1,995
Used GMC Sierra 2500HD
21 Great Deals out of 1,338 listings starting at $3,995
Used Ford F-250 Super Duty
30 Great Deals out of 923 listings starting at $2,475
Used Chevrolet Silverado 1500
190 Great Deals out of 11,142 listings starting at $1,700
Used Chevrolet Silverado Classic 2500HD
4 listings starting at $12,900
Used Ford F-250
4 listings
Used Chevrolet Silverado 1500HD
4 listings starting at $9,495
Used Chevrolet Silverado 3500HD
7 Great Deals out of 722 listings starting at $13,940
Used GMC Sierra 1500
240 Great Deals out of 11,198 listings starting at $399

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.