Oil Viscosity Recs
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From: Washington,KS/Lincoln,NE
Oil Viscosity Recs
When the 6.4 was new, the most commonly recommended engine oil was 5w40. Right away my dealership said that had changed. When they serviced my truck (they asked to be allowed to do it first time) they put in 15w40. Last October, I had my front main seal replaced and the ticket again says they used 15w40.
What is the wisdom on whether we should be using 5w40 vs. 15w40? I have Archer Gold 15w40 CJ-4/SM parasynthetic on hand that I only use in this engine. As cold as it's been, I'm wondering if I should be using 5w40. Archer Petroleum has just released Gold (synthetic) 5w40 CJ-4/SM. When the 6.4 was first out they drug their feet on it a little. I've used Archer Lubricants since I was a kid. They have as good a warranty as any lubricant I know and have performed very well for me. An added bonus is that they provide free oil analysis. All it costs is the postage to submit the sample. They provide everything else, including a phone call if they encounter a problem. I went to 15w40 on my dealer recs and the fact that Archer had it available in a CJ-4/SM. Now I'm wondering!!! Thanks!
What is the wisdom on whether we should be using 5w40 vs. 15w40? I have Archer Gold 15w40 CJ-4/SM parasynthetic on hand that I only use in this engine. As cold as it's been, I'm wondering if I should be using 5w40. Archer Petroleum has just released Gold (synthetic) 5w40 CJ-4/SM. When the 6.4 was first out they drug their feet on it a little. I've used Archer Lubricants since I was a kid. They have as good a warranty as any lubricant I know and have performed very well for me. An added bonus is that they provide free oil analysis. All it costs is the postage to submit the sample. They provide everything else, including a phone call if they encounter a problem. I went to 15w40 on my dealer recs and the fact that Archer had it available in a CJ-4/SM. Now I'm wondering!!! Thanks!
Last edited by Larry NCKS; Jan 16, 2009 at 11:39 AM. Reason: typo
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No change have been made in the oil recommendations. What is listed above is still valid and is also shown in the workshop manual which is regularly updated...
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From the below link...
Operating range above 20 degrees farenheit 15W40
Operating range above -20 degrees farenheit 5W40
Operating range 0 - 50 degrees farenheit 10W30
Operating range below 50 degrees farenheit 0W30/0w40
superduty
Operating range above 20 degrees farenheit 15W40
Operating range above -20 degrees farenheit 5W40
Operating range 0 - 50 degrees farenheit 10W30
Operating range below 50 degrees farenheit 0W30/0w40
superduty
and my dealer rec. 15w40 is that not retarded. wtf !!!
This is what I was tring to figure out last nov.
Anyone else running 15w40 up in north country ??
north I mean Boston, not north of the border
I will go right now and get her changed
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In BC, the Ford dealers will use 10W0-30 in the winter and 15W-40 in summer. You must have 15W-40 or 5W-40 to tow. That is why I use 5W-40 Mobil 1. The 5W-40 can be used from -20F/-29C to 100F/38C. 15W0-40 is not recommended by Ford below 20F/7C. Below this temperature you can use 10W-30 but cannot be used for heavy duty driving or trailer towing.
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Show them the 6.4 supplement that is with your owners manual and then ask them what the low was today.
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