I have been told to run 10W30 oil diesel rated oil for my 1hz and my previous 1hd-t. This is what the japanese run and also what a sticker states on the airbox of most 1hz and 1hd-t cruisers that come out of japan. Japan and BC have similar climates.
I have always made the effort to always buy high quality oil in my case I always buy Shell Rotella T because it is what I have access to where I live and what the truckers run here.
I change my oil at a max of 5000kms religiously.
Out of curiosity one day I decided to get an oil analysis done. My lead numbers came out a bit high indicating bearing wear. This freaked me out a bit when comparing it to other cruisers analysis results. I decided I was going to finish my pail of 10w30 and get another analysis done to see if the cold snap starts and city driving was the main culprit in my high lead numbers. I still had high lead numbers on the second test.
I ended up switching to Rotella T 15W-40 after the 10w-30 supply was finished and was unable to get a full interval with my changes due to a variety of trips I took with the truck. I changed my oil for a big trip I did and I knew after the trip I would get a full 5000kms interval. I could get a good sample finally. I got my oil analyzed and I finally see acceptable lead numbers in comparison to running 10W30. It doesn't look like I need to run a synthetic in the truck.
I don't see the point running a synthetic for the purpose of extended intervals in an IDI diesel because the soot and acidity is far higher than an DI diesel. DI diesels can easily run synthetic and push 10,000km intervals. Its still cheaper for me and I am sure others to run a high quality dino oil in an IDI diesel with 5000km intervals to keep things simple.
Hope this helps other people out with their 1hz or 1hd-t engines when it comes to running a better weighted oil. I personally don't think 10w-30 is suited to these trucks, maybe in very cold conditions but I think maybe running a 5w40 or something might have better protection once up to temperature.
Here is my oil analysis results:
I have always made the effort to always buy high quality oil in my case I always buy Shell Rotella T because it is what I have access to where I live and what the truckers run here.
I change my oil at a max of 5000kms religiously.
Out of curiosity one day I decided to get an oil analysis done. My lead numbers came out a bit high indicating bearing wear. This freaked me out a bit when comparing it to other cruisers analysis results. I decided I was going to finish my pail of 10w30 and get another analysis done to see if the cold snap starts and city driving was the main culprit in my high lead numbers. I still had high lead numbers on the second test.
I ended up switching to Rotella T 15W-40 after the 10w-30 supply was finished and was unable to get a full interval with my changes due to a variety of trips I took with the truck. I changed my oil for a big trip I did and I knew after the trip I would get a full 5000kms interval. I could get a good sample finally. I got my oil analyzed and I finally see acceptable lead numbers in comparison to running 10W30. It doesn't look like I need to run a synthetic in the truck.
I don't see the point running a synthetic for the purpose of extended intervals in an IDI diesel because the soot and acidity is far higher than an DI diesel. DI diesels can easily run synthetic and push 10,000km intervals. Its still cheaper for me and I am sure others to run a high quality dino oil in an IDI diesel with 5000km intervals to keep things simple.
Hope this helps other people out with their 1hz or 1hd-t engines when it comes to running a better weighted oil. I personally don't think 10w-30 is suited to these trucks, maybe in very cold conditions but I think maybe running a 5w40 or something might have better protection once up to temperature.
Here is my oil analysis results:
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