On Sun, 02 Jul 2017 19:22:13 -0500, dpb wrote:

On 07/02/2017 5:19 PM, Terry Coombs wrote:
...
Depends on what ya been burning up til now . I switched from a paraffin
based eastern crude to Castrol in a truck (86 GMC 305 cid) and it
started burning oil because the oil cut the paraffin based crud/deposits
from the valve seals . Replaced them while I had it down for a timing
set R&R and all is now well .

+1 on the paraffin-based. Had old Chevy 350 plug up the return holes on
7 and 8 cylinders from the crap one of them left in the upper valve
covers -- was one of the early pollution-control systems and
consequently ran hotter than earlier of same vintage; was the death
knell for it. Rebuilt with new mains and all and did the switch to
Castrol and it did another 250K before donating it to one of the
charitable contributions outfits...


Thats what happened to the E350. After sitting with 1990 oil in it
for 25 yrs..simply changing the oil without a flush of the engine with
diesel fuel instead of oil..allowed a **** ton of oatmeal to remain in
the engine and plug up all the oil ports and passages. Which required
a rebuild, crank regrind, new rod bearings etc etc after having the
engine dipped. 4000 miles and it ****ed all the important moving parts
up.

Sigh


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