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engine oil?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 1st timer, Dec 13, 2000.

  1. 1st timer

    1st timer Registered Member

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    is 10-40 to thin an oil for an engine with over 160k miles if it is what do you guys recommend
     
  2. Rayven90

    Rayven90 Registered Member

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    I have 152,000 on mine and I still run 10-30 with about 50 psi on the guage. I also have Fuel injection so I need that thinner oil when I first start up.

    Ray
     
  3. backlash

    backlash 1/2 ton status

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    I've been using 10-30 Penzoil since brand new. This AM though when really cold...could hear what sounded like a main bearing knocking for a bit. At 180,000, I know I'll be shopping for a motor before long.

    Would you guys recommend a 5 wt. for the above symptoms? Today was the first time I heard it!
     
  4. Can Can

    Can Can Pusher Man Staff Member Super Moderator

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    Hey Bob- my truck does the same cold start knocking when my oil starts to get dirty and the filter plugs up a bit. Normally an oil change will fix it right up. FYI, it's been hitting -20 Farenheit for the last few nights up here.

    I've been running 10w30 both winter and summer for 8 years.
     
  5. HarryH3

    HarryH3 1 ton status Author

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    Can you even buy 10-40 any more? That stuff got a bad reputation several years ago because of all the chemical additives they have to add to get the 30-point viscosity spread. The additives were caking onto the piston rings and causing them to break prematurely.

    I run Mobil 1 pure synthetic, since they don't have to use additives to get it to behave in different temps. Seems to be great stuff!

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  6. Channing74

    Channing74 Registered Member

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    Down here in louisiana we dont worry about extreme temps other than heat so I run 30w to keep the valve guides from leaking so much. But when I replace the motor in a couple of months I will be going for Mobile 1 ......

    Bigger Is Better
    Channing74
     
  7. mudpuppy89k5

    mudpuppy89k5 Registered Member

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    Marietta, Ga
    I've been running Castrol straight 30W in my '89 since it was new. Blazer has 200,000 miles and the engine doesn't leak or burn any oil. I ran the 30W in a '85 K20 before I bought the Blazer and in a '73 Z/28 before that. A buddy and I had a boat a while back with twin 350 inboards. We ran the same 30W Castrol and PF-35 filters in it. I also put the 30W in my lawnmower. I guess you can tell I like it.

    The only problem I've had is that the 30W can get pretty thick on cold mornings. In the past, I've run Castrol 20W50 in the winter months. A friend of mine suggested Shell Rotella-T 15W40 which I'm going to try this year.

    I've had an occasional knocking sound when I first crank the Blazer for quite a while. I tried different oil additives and it didn't seem to make a difference. It hasn't gotten any worse and still runs strong, so I quit worrying about it. I'm planning on building a four bolt main 350 or, even better, a 454, so that problem becomes moot.

    John Perry
    http://www.mudpuppy.coloradok5.com/
     
  8. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    i also run 30w in mine with no problems

    s.smith 77blazer lookin 4 mud
     
  9. Hobbes68

    Hobbes68 Registered Member

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    I use 10W30 in the winter months and 20W50 in the summer months. 117,000 miles and no problems...
     
  10. HarryH3

    HarryH3 1 ton status Author

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    Don't run the Mobil 1 in a fresh rebuild. It's too slippery to let the rings seat themselves correctly. Run a good grade of standard oil for the first 10K miles or so and then go to Mobil 1.

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  11. 90K5

    90K5 1/2 ton status

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    I run Pennzoil 10w-40 in mine and never had a problem at 134K

    90K5
     
  12. UseYourBlinker

    UseYourBlinker 1 ton status

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    I also use 10w-40 and never had a problem.

    If it ain't a Chevy, don't raise it up!
     

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