Lubrication Discrepancies

[Chrisrog]

I have a 2002 SAN with the PCM Excalibur 330 (5.7L GM), a PCM 1:1 transmission, and Walter Gear V drive.

I'm finding multiple discrepancies in the manuals and on the components regarding lubrication and fuel.

Engine Oil (above 50°):
Owner's Manual - 40W40
PCM Manual - 15W40 "SJ"
PCM Service bulletin - 15W40 "GF-4/SM"
Motor shroud label - 15W-40

Conclusion: I think I should use a synthetic 15W40

V Drive Oil:
Owner's Manual - SAE #30 oil
PCM Manual - Dexron III, also SAE #30 oil (book isn't consistent)
Motor shroud label - Dextron III (sic)
Label on V Drive - SAE 30

Conclusion: No clue. What happens if the person before me used a different lubricant than the one I select?

Transmission Fluid:
Owner's Manual - Dexron
PCM Manual - Dexron III
Motor shroud label - Dextron III (sic)
Label on Transmission - Dexron III

Conclusion: This one is easy, even if the factory misspelled Dexron on the motor.

Gasoline:
Owner's manual - No more than 10% ethanol
Motor shroud label - 89 octane min,
Gas cap label - No alcohol in fuel
PCM manual - 87 octane - no alchohol in fuel

Conclusion: Should probably stay away from alcohol in fuels and stick with 89 octane.

The motor shroud label specifically says to check the owner's manual....which seems to have the least clue...any insight?

[NautiqueJeff]

Here's the latest on oil requirements.

https://www.planetnautique.com/vb5/f...specifications

[03SANTE]

I have the 03 with Excalibur and Walters V Drive...all identical to yours I believe. I agree and use the 15w40 oil. Have been running Delo Heavy Duty brand from Walmart with no issues and I don't ever need to top off during the season.

In my PCM manual there is a misprint in the chart showing "Transmission and V Drive Oil Requirements" where is says Dextron for all types. If you continue reading through the manual it specifically says SAE30 for Walters V Drives in two other places. So that is what I run in the V Drive.

And yes Dextron in the PCM transmission.