| Oil recommendations? [message #347646] |
Tue, 10 September 2019 16:38  |
agoogol
Messages: 43
Registered: August 2019
Location: Centennial, Colorado
Karma: 0
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Going to do my first oil change on my 77 GMC with the 403....what does everyone recommend nowadays for an oil to use? 62k miles, probably won't drive too much for the next year or so, just around town/shorter trips to the mountains etc until I invest in enough to make her more reliable.
Seems like all the articles are old on t his subject, so I thought I would throw it out there!
Kevin Carter
1977 Kingsley - 403 c.i.
Centennial CO
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| Re: Oil recommendations? [message #347652 is a reply to message #347646] |
Tue, 10 September 2019 19:45  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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<popping popcorn>
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Oil recommendations? [message #347654 is a reply to message #347646] |
Tue, 10 September 2019 20:26 |
agoogol
Messages: 43
Registered: August 2019
Location: Centennial, Colorado
Karma: 0
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Synthetic 10 - 40 is what I am coming to and then be able to use it in the Onan as well. Of course that's provided I get the Onan running. Doesn't really make or break anything I'm sure.
Kevin Carter
1977 Kingsley - 403 c.i.
Centennial CO
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| Re: Oil recommendations? [message #347660 is a reply to message #347646] |
Wed, 11 September 2019 07:50 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I only use Shell Rotella T6 5W-40 full synthetic. I think the 5 cold weight is beneficial in vehicles that sit long periods as these do to flow to parts quickly at startup.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: Oil recommendations? [message #347662 is a reply to message #347646] |
Wed, 11 September 2019 08:21 |
Russell K.
Messages: 178
Registered: October 2016
Location: Dunedin, Florida
Karma: 4
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Kevin,
The oil question will get many different answers. Everyone has their favorite oil. More important than brand, is frequency. Change the oil often, and get your used oil analyzed at Blackstone Laboratories to monitor engine wear and potential problems. Oil is cheap compared to the cost of replacing an engine.
Here is a good article from Blackstone about which oil is best.
https://www.blackstone-labs.com/wp-content/uploads/2018/09/Aug-17-ENG.pdf
BTW, I use Valvoline VR1 racing motor oil 20W-50 in my high mileage '78 403, and change it around 2k-3k miles. Some may chime in as to why its the wrong oil for this application. That's OK. We all need to be willing to learn from the experience of others.
Here is a copy of the oil analysis from my most recent oil change.
http://www.gmcmhphotos.com/photos/data/7215/Oil_Analysis_HARRYS_403-190420.pdf
Welcome to the group. We all love our GMC's.
Safe Travels,
Russell
1978 Eleganza II, Dunedin, Florida
[Updated on: Wed, 11 September 2019 08:45] Report message to a moderator |
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| Re: Oil recommendations? [message #347673 is a reply to message #347662] |
Wed, 11 September 2019 10:17 |
mghamms
Messages: 466
Registered: March 2016
Location: Ware, Massachusetts
Karma: 2
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I use Mobil 1 15w50. But most anything will work fine.
A ways change the filter.Use whatever floats you boat.
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
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