IPD sale XeMODeX - Experts in Volvo Electronics
Did you know? 🤔
Logged in users can get email notification of topic replies Log in or register (free).
Amazon Link Buy anything with this and it helps MVS!

Synthetic Oil-- why can't you switch back/worth it?

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

viper69
Posts: 429
Joined: Sat Jun 26, 2004 6:41 pm
Year and Model: 850GLT 1995
Location: USA
Has thanked: 53 times
Been thanked: 1 time
United States of America
viper69

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by viper69 » Fri Nov 18, 2016 4:18 pm

rspi wrote:This is the most reasonable engine oil thread I have ever read. Lol

I purchased my DD with 189,000 miles, switched to synthetic after I serviced the PCV at 191,000 and now have 333,548. Have done 2 Blackstone oil samples, about to do a third.

My engine has never been opened and developed a leak which I have not fixed at about 300,000.



Thanks for this video. Previous to posting I thought the people who told me one cannot switch back to normal oil were spewing some "crap" because they wanted to make money. But Mobil has no incentive there as they sell both hah. So I'll go w/that.

They claim it doesn't affect seals. IF true, then why do people report leaks at times once they switched? I'm not convinced on this one.
Volvo 850 GLT 1995

5 Speed Manual transmission

122,500 miles and barely broken in

Previous:
'82 Volvo DL Wagon, 4 speed manual
'77 Saab 99 EMS, 4 speed manual

tryingbe
Posts: 1891
Joined: Thu Jun 18, 2009 12:43 pm
Year and Model: None
Location: Mesa, AZ, USA
Has thanked: 0
Been thanked: 23 times
United States of America
tryingbe

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by tryingbe » Fri Nov 18, 2016 7:42 pm

viper69 wrote:
They claim it doesn't affect seals. IF true, then why do people report leaks at times once they switched? I'm not convinced on this one.
How would an oil affect seals? If the seal is in bad condition, it's gonna leak. Synthetic flows better than convention, so synthetic oil will appear to be leaking out faster and making a larger pool on the ground.

85 GLH, 367 whp
00 Insight, 72 mpg

User avatar
rspi
Posts: 7278
Joined: Sat Nov 05, 2011 10:40 am
Year and Model: 850 T-5R Wagon
Location: Albuquerque, NM
Has thanked: 22 times
Been thanked: 49 times
United States of America
rspi

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by rspi » Fri Nov 18, 2016 9:06 pm

My take on oil leaks is... synthetic oils have better cleaning agents, etc., so, it will start to clean away sludge, etc. If you have bad or weak seals, and there is some sludge built up around them, and the synthetic oil starts to clean that away, it will probably leak soon. My opinion... change the seals if they are bad. Did synthetic oil cause the leak??? A better question is, would you rather have sludge in the engine or a clean engine with leaking "bad" seals? I'd rather clean the inside of the engine, give it better oil, and fix any leaks.
Last edited by rspi on Sat Nov 19, 2016 12:43 pm, edited 1 time in total.
'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
--------------------
Volvo's of past: '87 740 GLE, '79 262C Bertone, '78 264, 960's, '98 S70 GLT, '95 850 T-5R YellowVolvo Repair Videos

viper69
Posts: 429
Joined: Sat Jun 26, 2004 6:41 pm
Year and Model: 850GLT 1995
Location: USA
Has thanked: 53 times
Been thanked: 1 time
United States of America
viper69

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by viper69 » Sat Nov 19, 2016 12:30 pm

Thanks a lot guys that helps me a lot!
Volvo 850 GLT 1995

5 Speed Manual transmission

122,500 miles and barely broken in

Previous:
'82 Volvo DL Wagon, 4 speed manual
'77 Saab 99 EMS, 4 speed manual

User avatar
abscate
MVS Moderator
Posts: 21118
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 318 times
Been thanked: 989 times
Trinidad & Tobago
abscate

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by abscate » Mon Feb 25, 2019 5:26 am

MVS....the only car forum where you can have an oil change interval thread without a flame war, or someone getting banned...

😀
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
regent
Posts: 1254
Joined: Mon Feb 22, 2010 6:34 pm
Year and Model: 2015 XC60 T5
Location: Under the Hood
Has thanked: 1 time
Been thanked: 5 times
United States of America
regent

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by regent » Thu Mar 28, 2019 9:32 am

I realize I am running the risk of getting banned for exposing the deep secret that the engine oil DOES NOT appear on VOLVO's Lifetime Fluid List :lol:
Example of Precision: Measure with a Micrometer, mark it with Chalk, and then cut it with an Axe.
Disclaimer: We (very) seldom do that

2015 BMW 335i
2015 XC60 T5 Premier Plus
2002 S60 2.4 n/a - retired :(
1987 340 DL - retired :(

User avatar
abscate
MVS Moderator
Posts: 21118
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 318 times
Been thanked: 989 times
Trinidad & Tobago
abscate

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by abscate » Fri Mar 29, 2019 4:36 am

I did Blackstone on both my P2 and P80 Volvos this year. Mobil 1 with 7500 mile changes

Both showed that I could go to 10-12000 miles on those cars with oil still In specs. I’m sticking with a once a year on the P2, and using that oil for make up with the T5, about 1 liter per 2000 miles.

The T5 interval is 3-4 months on its usage schedule.
These users thanked the author abscate for the post:
WhatAmIDoing
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
WhatAmIDoing
Posts: 761
Joined: Sat Jul 30, 2016 1:13 pm
Year and Model: 1998 S70 T5M
Location: North America
Has thanked: 66 times
Been thanked: 56 times
Canada
WhatAmIDoing

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by WhatAmIDoing » Fri Mar 29, 2019 7:49 am

abscate wrote:
Fri Mar 29, 2019 4:36 am
I did Blackstone on both my P2 and P80 Volvos this year. Mobil 1 with 7500 mile changes

Both showed that I could go to 10-12000 miles on those cars with oil still In specs. I’m sticking with a once a year on the P2, and using that oil for make up with the T5, about 1 liter per 2000 miles.

The T5 interval is 3-4 months on its usage schedule.
I think the max interval I would feel safe with is 7,500mi on full synthetic in a turbo charged vehicle. I'm kind of impressed blackstone said you could go over 10k. Are you running Mobil1 10w-40 HM in the T5?
'98 S70 T5M - 282,000+mi - forever a project
'99 S70 "AWD" - 220,000+mi - part out :cry:
Knows enough to be dangerous :wink:

User avatar
abscate
MVS Moderator
Posts: 21118
Joined: Sun Feb 17, 2013 5:54 pm
Year and Model: 99T5 ,99S70,2005V70
Location: NYC, ALBANY NY
Has thanked: 318 times
Been thanked: 989 times
Trinidad & Tobago
abscate

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by abscate » Fri Mar 29, 2019 7:56 am

10W-30 Mobil 1 HM in the T5

We rarely breach 90F here in upstate NY, and when I am in the city, I take the Volvo Train down the Hudson in the P-Amtrak model.
These users thanked the author abscate for the post:
WhatAmIDoing
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

User avatar
erikv11
Posts: 9690
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 95 times
Been thanked: 284 times
United States of America
erikv11

Re: Synthetic Oil-- why can't you switch back/worth it?

Post by erikv11 » Fri Mar 29, 2019 11:07 am

abscate wrote:
Fri Mar 29, 2019 4:36 am
... with the T5, about 1 liter per 2000 miles.
That is pretty high consumption for a white block, I'm curious what's the mileage now on that engine?
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

Post Reply
  • Similar Topics
    Replies
    Views
    Last post