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hora
Original Poster
16,579 posts
80 months
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Ok, which one is thicker? I assume the 5w30 is thicker?
Whats best for reducing oil consumption- thicker oil so it can't get passed the O-rings?
10w40 is better for cold morning starts as its thinner gets round the engine quicker?
Also- which is better for the engine, semi or fully??
I'm bloody Confused.com
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essexplumber
7,286 posts
42 months
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hora said: Ok, which one is thicker? I assume the 5w30 is thicker?
Whats best for reducing oil consumption- thicker oil so it can't get passed the O-rings?
10w40 is better for cold morning starts as its thinner gets round the engine quicker?
Also- which is better for the engine, semi or fully??
I'm bloody Confused.com Err? Ones thicker than the other, or something.
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focusboy
274 posts
59 months
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5w30 is thinner, and thicker oil is less likely to get past worn seals as quickly.
Hth a little, Garry
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hora
Original Poster
16,579 posts
80 months
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focusboy said: 5w30 is thinner, and thicker oil is less likely to get past worn seals as quickly.
Hth a little, Garry Ta, so 10w40 is the safest-thickest option available? Do the terms semi and fully affect the viscosity further? (at all? )
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GaryST220
871 posts
53 months
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Don't forget about the ACEA specification, thats equally important when buying oil.
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MondeoMan1981
1,872 posts
52 months
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Whats the difference between 5w30 and 5w40 - some sites recommending different grades for my car !
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Taita
5,341 posts
72 months
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What do FORD say (assume mondeo)
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MondeoMan1981
1,872 posts
52 months
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Taita said: What do FORD say (assume mondeo) 206 1.4 hdi..... Planning to be in a Mondeo again in the future.... sad eh
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nottyash
3,703 posts
64 months
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A local Porsche specialist recomend Valvoline racing 20-50
It sound thick, but apparently it works well at reducing oil consumption through bore wear.
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checkmate91
439 posts
42 months
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No! Valvoline Racing 20/50 is a thick mineral-based oil for ancient cast iron engines like old chevy v8s, minis and so on (I've got 4x 5 litre bottles in the garage for my ancient mini). Modern tdis need 5/40 or 10/40 (fords 5/30). 10/40 is thicker if this is the answer you're looking for. 15/40 diesel oil is for ancient diesels (peugeot 504, landrovers etc)
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Dr.Doofenshmirtz
6,915 posts
69 months
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LuS1fer
28,551 posts
114 months
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The Society of Automotive Engineers (SAE) established a numerical code system for grading motor oils according to their kinematic viscosity.
The viscosity of single-grade oil derived from petroleum unimproved with additives changes considerably with temperature. As the temperature increases, the viscosity of the oil decreases in a relatively predictable manner. On single-grade oils, viscosity testing can be done at a cold, winter (W) temperature to grade an oil as SAE number 0W, 5W, 10W, 15W, 20W, or 25W.
The temperature range the oil is exposed to in most vehicles can be wide, ranging from cold ambient temperatures in the winter before the vehicle is started up to hot operating temperatures when the vehicle is fully warmed up in hot summer weather. A specific oil will have high viscosity when cold and a low viscosity at the engine's operating temperature. The difference in viscosities for any single-grade oil is too large between the extremes of temperature. To bring the difference in viscosities closer together, special polymer additives called viscosity index improvers, or VIs are added to the oil. These additives make the oil a multi-grade motor oil.
10W-30 designates a common multi-grade oil. Historically, the first number associated with the W (again 'W' is for Winter, not Weight) is not rated at any single temperature. The "10W" means that this oil can be pumped by your engine as well as a single-grade SAE 10 oil can be pumped. The second number, 30, means that the viscosity of this multi-grade oil at 100°C (212°F) operating temperature corresponds to the viscosity of a single-grade 30 oil at same temperature.
(Stolen from elsewhere)
Modern cars tend to specify a 5w20 but i suspect this is to improve mpg artificially.
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Bonefish Blues
4,150 posts
92 months
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hora said: Ok, which one is thicker? I assume the 5w30 is thicker?
Whats best for reducing oil consumption- thicker oil so it can't get passed the O-rings?
10w40 is better for cold morning starts as its thinner gets round the engine quicker?
Also- which is better for the engine, semi or fully??
I'm bloody Confused.com At a given ambient temperature within a range 10-30 degrees they are the same thickness. The 5/30 protects better at low temps as it flows more easily, being designed to operate from the lower temp, hence the 5 lower rating. The 10/40 protects better at ambient temps over 30 degrees, since it's designed to do so, hence the 40 upper rating. Synthetic almost always better than semi. ...if I've been paying correct attention to Oilman these many years!
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Ozzie Osmond
12,117 posts
115 months
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For practical purposes a good quality oil of either viscosity will be absolutely fine. The thinner 30 weight will give marginally better fuel consumption, but it's mere fractions.
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hora
Original Poster
16,579 posts
80 months
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Its a 1.8VVTI (Toyota) engine- the design that potentially has a oil thirst. So I was thinking warmer weather go for thicker. I'm not too bothered about 3mpg either way. Its driven less than a 1,000miles a month. I do want it to be reliable and worth something sometime in the future maybe.
So 10w40 is best or could I go further?
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LuS1fer
28,551 posts
114 months
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The Mustang recommends 5w30 but I used Mobil 1 0w/40 in it without any problem though have now switched to 5w/30. Difference? Hard to spot. In truth, in the UK, you are not really going to have to worry about the two extremes too much.
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Munkeyfeet
365 posts
49 months
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Ten years ago, a crack oil man was sent to prison by a military court for a crime he didn't commit. This man promptly escaped from a maximum security stockade to the UK underground. Today, still wanted by the government, he survives as a soldier of fortune. If you have an oil problem, if no one else can help, and if you can find him, maybe you can hire... OPIEOILMAN.
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