Hi,
for what it is worth, this data concerning my DD Series 60 diesels may be of interest;
1 - A well known mineral 15W-40 HDEO was at condemnation point at around 22kkms (cost $3 per ltr)
2 - A semi-synthetic 15W-40 HDEO was at condemnation point at around 40kkms (cost $4.50 per ltr)
3 - A fully synthetic 5W-40 HDEO was at condemnation point at around 90kkms (engine fitted with by-pass centrifuge)(cost $9 per ltr)
Note A - Engine manufacturers prescribed OCI of 15kkms when using an Approved lubricant
Note B - The condemnation point with 1 and 2 above was thickening out of engine manufacturer's limits
Note C - The condemnation points with 3 above was either of Iron or Soot at or above engine manufacturer's limits. The viscosity was always within limits
The economic break even point of the synthetic/centrifuge combination occurred for me at 70kkms over the semi-synthetic (and four years or 1m kms retention of vehicle). Other benefits with 1 above were better engine cleanliness, less wear of valve train components and easier starting in sub-zero temperatures throughout the OCI cycle
Hundreds of UOAs on my own database support these comments
for what it is worth, this data concerning my DD Series 60 diesels may be of interest;
1 - A well known mineral 15W-40 HDEO was at condemnation point at around 22kkms (cost $3 per ltr)
2 - A semi-synthetic 15W-40 HDEO was at condemnation point at around 40kkms (cost $4.50 per ltr)
3 - A fully synthetic 5W-40 HDEO was at condemnation point at around 90kkms (engine fitted with by-pass centrifuge)(cost $9 per ltr)
Note A - Engine manufacturers prescribed OCI of 15kkms when using an Approved lubricant
Note B - The condemnation point with 1 and 2 above was thickening out of engine manufacturer's limits
Note C - The condemnation points with 3 above was either of Iron or Soot at or above engine manufacturer's limits. The viscosity was always within limits
The economic break even point of the synthetic/centrifuge combination occurred for me at 70kkms over the semi-synthetic (and four years or 1m kms retention of vehicle). Other benefits with 1 above were better engine cleanliness, less wear of valve train components and easier starting in sub-zero temperatures throughout the OCI cycle
Hundreds of UOAs on my own database support these comments
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