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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
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1997 - 2000 V70-XC
1997 - 2004 C70

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

Post by abscate »

erikv11 wrote: 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?
230k

Its all leakage. I have not been able to pinpoint the source. I should break down and get the UV dye and track it down, honestly
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Re: Synthetic Oil-- why can't you switch back/worth it?

Post by MoVolvos »

*

Last year and currently Costco was and is having a sale on Mobil 1 and I saw the 0W-40 for the first time.
Mobil 1 Full Synthetic Motor Oil 0W-40 - Great Price By The Way
https://www.costco.com/Mobil-1-Full-Syn ... 69676.html

Years ago I had vowed to never used Mobil 1 but the price of $28.69 for 6 quarts and the 0W-40 year round oil was just too tempting. Well, not long after the 03 GS300 ~ 150K and 03 Odyssey ~ 220K both started seeping at the valve covers. Back to Rotella T6 and Swepco 308.

The Rotella I purchased when it was on sale for $12.00 a gallon without reading/knowing that it was a synthetic when I first acquired the Odyssey at 155K. It is the only Synthetic I use now. I think one change was at 10K and another 15K. Have always tried changing the oil every 6 months or max at 7K miles but just couldn't get around to it both times and the vehicles ran fine.

The Mobil 1 created 3 head gasket leaks years ago at different times so it took awhile for me to figure it out (88 Camry, 93 E300 and 99 Galant). Started using it around 94 and the Merc had a head gasket replacement at 60K. The other 2 cars had 100K to 200K when I introduce Mobil 1. I have not tried other Synthetics besides Mobil and Rotella (If My Memory Serves Me Right).

Here are two articles on Synthetic oils and why you should not switch or switch back and forth (especially Mobil :wink: )

https://blog.fcpeuro.com/what-type-of-o ... -in-my-car

https://blog.fcpeuro.com/when-it-isnt-b ... thetic-oil
Blessings,

BKM

1998 S70 T5 - Donated
2003 S80 T6
2003 GS300
2003 Odyssey
2008 C30 T5
2019 Atlas SE 4 Motion
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Re: Synthetic Oil-- why can't you switch back/worth it?

Post by abscate »

abscate wrote: Fri Mar 29, 2019 12:20 pm
erikv11 wrote: 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?
230k

Its all leakage. I have not been able to pinpoint the source. I should break down and get the UV dye and track it down, honestly
...and I finally nailed it earlier in month replacing the turbo oil drain line and O ring seal. Engine is now totally dry. I suspect oil consumption will also drop.
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Re: Synthetic Oil-- why can't you switch back/worth it?

Post by erikv11 »

Yeah I saw you figured out that small leak. Let us know about the oil consumption I’m always curious about that. One thing I’ve learned all my cars use more (ie some) when they get a lot of highway time.
'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, 293k
'06 S60 R, 167k
'99 Camry V6 :shock: 130k
gone: '96 NA 850 210k, '98 NA V70 182k
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Re: Synthetic Oil-- why can't you switch back/worth it?

Post by smoggyama »

Synthetic can take heat better.
Life is like a box of chocol- make that an engine compartment. You never know where all the hoses go. Unless you read the diagram on the hood. When all else fails, follow the instructions. Do it right the 2nd time.
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Re: Synthetic Oil-- why can't you switch back/worth it?

Post by abscate »

I did run the Penzoil 10w-30 full synthetic in Elizabeth for one oil change and had a lot of valve stem seal smoke

Going back to either Castrol or Mobil 1 High mileage fixed that

Still using I liter per 2500-3000 or so.
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