Switching to Synthetic Oil - Flus Needed ???

I'm switching from petroleum oil to Mobil 1 - V70 2.5T. Do I just drain,
replace filter and fill with Mobil 1? Some old oil will be left - will they
mix OK - or do I need to flush with something?

 

They'll mix fine, just do as you planned.

 

CONGRADULATIONS but what about BP synthetic is cheaper & better 5w-50w Mobil
VS 5w- 40w BP .Here Mobil has gone up to @ $AU65toAU $74dollars for 5
litres against BP Synthetic 5000 at AU $39.74 for 4 litres .As our
Australian dollar is 80cents US it makes BP 5000 Synthetic good value .WATCH
your engine run smoother and cooler as well as fuel economy increased .

 

Suggest you stick with Mobil 1 10-30 to avoid possible noisy lifters. You
should not need to do anything to flush your engine; just change the oil and
filter and use a new aluminum crush washer on the drain plug. I have been
using Mobil 1 for over 500,000 miles in several cars (latest being a 1995
850 turbo with 127,000 miles now) with no engine related problems of any
type. I always change oil and filter every 3 to 5 thousand miles or 6
months, whichever comes first; I know that is probably overkill, but oil is
cheap compared to engine repairs.

Just my 2 cents worth.

 

I got the word years ago from a friend in lubricant research for
Standard Oil in the San Francisco Bay Area: the *first* thing with a
new product is to make sure that it is absolutely compatible with
existing oils from other manufacturers. Unless there were "surgeon
general's" warnings as to mixing problems, the liability issues would be
huge.

In my "boy racer" days of many years ago, I once used a product that had
mixing issues with petroleum based products (it way totally
artificial). They warned you and even provided a special flushing
material. Both the flush and the lubricant worked just great.

bob noble
Reno, NV, USA

 

I don't think I would worry about it. After all what are syn/reg blends?

--

Njord

For me, my craft is sailing on,
Through mists to-day, clear seas anon.
Whate’er the final harbor be
’T is good to sail upon the sea!
The Voyage
John Kendrick Bangs. (1862?1922)

 

Synthetic are fully compatable with petrolium base products.

 

No need to flush... just drain it real well. Replace your oil & filter.
Just switched to Mobil 1 10W-30 on my "new" 01 V70 2.4T.
I just bought it with 62K and replaced oil immediately even though
it was at the Volvo dealer at 60K according to it's maint. book.

The cost wasn't even that much different... got it for $4.22/quart.
Funny the 5 quart container actually cost about $5.50/quart, so
they're encouraging you to buy 1 quart containers.