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1dodge1mopar
User
Jan 17, 2017, 8:41 PM
Post #1 of 6
(1352 views)
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I have 10W-30 ROYAL PURPLE synthetic oil in my SILVERADO. I'm thinking about trading for a DODGE RAM.
I have looked a lot on ebay for SYN oil. I see a lot of MOBIL 1 "0W-40". is there a RATIONAL reason for oil this VISCOSITY??? is it that SYN oil holds a "HIGHER" viscosity than crude???
I live in the AMES, IOWA area in CENTRAL IOWA. the temps go from -20* (sometimes) to 105*F. would this VISCOSITY have a problem with these temperature extremes...or should I stay with the 10W-30 SYN oil????
THANX
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jan 17, 2017, 11:33 PM
Post #2 of 6
(1340 views)
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Re: SYNTHETIC OIL
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A lot of "lore" on synthetic oil out there so I can only expound on what I use myself NEVER to buy on line oil just a thing with me.
Do always use the vehicle maker's suggested rated viscosity oil and understand when "viscosity" means - I'll let you look that up for details.
Site is owned and sponsored by Amsoil not available to me easily so can't use their products which leaves me with the others and think Mobil 1 is the largest seller of synthetic oils I do find superior if only that they maintain the original specs lots longer than conventions oils.
Some is opinion, and some educated guessing. I suggest that most vehicles will want now a 0-20, up to a 5-30 range. Mobil 1 sells a 0-30 claims to meet or exceed specs for 5 or 10-30 but just FYI and noticed that the "0" grade really does flow noticeably quicker when below ZERO especially common for where I am as well and high temps also routinely reach 105F real air temps not the wind chill or heat index calculations.
IMO the wider the range of the oil the more of it is additives than the oil desired so shorter range should then be more real product than probably less desirable additives so forgo the 40 grade for the 30 as the top number is likely better for the long run. You can see this if you have an oil pressure gauge in vehicle if credible it's staying within spec at idle speeds at either extreme.
Again IMO any oil still must be changed out as it will be diluted with dirts and contaminants over suggested miles and time counts as well if not garaged especially.
First priority with any is not to run any too long or ever run lower then the near universal 1 qt. low mark as seen on a dipstick NOT some warning if equipped that can and will be wrong or fail in time doesn't take the place of actually checking oil level for real periodically,
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 18, 2017, 4:39 AM
Post #3 of 6
(1326 views)
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Re: SYNTHETIC OIL
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Yes, the vehicle manufacturer determines what viscosity of oil that should be run in their vehicles. It is not just a personal choice.
Specific engines are engineered to operate with specific viscosities and most vary only slightly with climate conditions.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Jan 18, 2017, 4:39 AM)
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kev2
Veteran
Jan 18, 2017, 7:15 AM
Post #4 of 6
(1311 views)
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Re: SYNTHETIC OIL
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two thoughts -
most late model GM's are 5w30 - what year and engine?
Also IDK - is Royal purple 10W30 DEXOS eapproved?
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1dodge1mopar
User
Jan 18, 2017, 12:18 PM
Post #5 of 6
(1291 views)
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Re: SYNTHETIC OIL
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2001 SILVERADO 1500/5.3 LITRE/4X4/AUTO
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 18, 2017, 1:27 PM
Post #6 of 6
(1284 views)
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Re: SYNTHETIC OIL
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Here is what the manufacturer says
API Classification
Look for Starburst Symbol
Grade 5W-30 (preferred)
Above -18°C (0°F) 10W-30, 5W-30 (preferred)
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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