GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » Blackstone Labs and ZDDP oils
Re: [GMCnet] Blackstone Labs and ZDDP oils [message #109480 is a reply to message #109469] Wed, 22 December 2010 17:42 Go to previous messageGo to previous message
fred v is currently offline  fred v   United States
Messages: 999
Registered: April 2006
Location: pensacola, fl.
Karma:
Senior Member
Robert Mueller wrote on Wed, 22 December 2010 16:54

Larry,

I went to SAE 40 Royal Purple because I think it is an oil consumption issue
related to engine speed and going to a single viscosity oil might help. This
may be wishful thinking but I had a chat with the manager of the NAPA store
where I bought the oil and the Royal Purple customer service engineer and
the consensus that it would be worth a try to see what happens. If it didn't
help it was an engine / ring / valve guide issue.

The engine in Double Trouble was rebuilt by Ken Frey about 50,000 miles ago,
had no sludge in the valve covers when I replaced the gaskets, no sludge in
lifter valley just the "normal" burnt on crud when I swapped over to the
aluminum manifold, and virtually none in the crankcase when I replaced the
single drain oil pan with the dual drain.

Regards,
Rob M.
USAussie - Downunder

-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Larry
Sent: Thursday, December 23, 2010 4:19 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Blackstone Labs and ZDDP oils



you are aware that it takes some time for all the oil to run back to the pan
so when you stop for gas your oil will always read low for about 20 minutes.

Fred V



i've had consumption problems since buying my coach in '06. i first went to Mobil 1 oil with no change. since then i've changed the intake valve seals to the "positive seal" type, changed to the proper PCV valve, changed to the correct valve covers, calibrated the dip stick, all with no change in oil consumption. my engine was rebuilt 20K miles ago by the PO. i suspect a bad rebuild, probably rings or loose fitting pistons. i gave up and am looking for an engine to build and have ready when needed.

Fred V
'77 Royale RB 455
P'cola, Fl

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: OKC Lunch Bunch - January
Next Topic: Re: [GMCnet] Idiots Guide to Finding 1973-1978 GMC MotorhomeInformation on the Internet
Goto Forum:
  


Current Time: Mon Jul 01 05:50:42 CDT 2024

Total time taken to generate the page: 0.01638 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software