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<blockquote data-quote="Mishima" data-source="post: 4465259" data-attributes="member: 70430"><p>Oh yea, there's new question, I dunno is there anymore sifus to clarify this for me... They are:-</p><p>1) Will changing the gearbox gives more power-band and torque? Put in an example, fitting in a 4g15 gearbox into the 4g13 engine.</p><p></p><p>2) Is it possible to use the 4G13 engine but fit in 4G91 gearbox? If possible, which is better? 4G15 gb or 4G91 gb?</p><p></p><p>3) If convert the engine from Carburetor to EFI, will be boost performance as well be more fuel effective? What is the estimate cost of conversion, and is it worth it?</p><p></p><p>4) Lets say Carb with modded exhaust system converted to EFI, will it cause power loss and fuel inefficiency?</p><p></p><p>5) Now regarding engine oil, a friend of mine told me that engine oil has expiry dates. His mechanic that he promotes me to at Klang quoted me an oil change (oil + labour + filter) at RM80 for Eneos Eco Touring (15-40) at RM80 but Eneos Jusco Kepong is selling at much lower price. I asked why, he told me that the oil sold there surely 'expired' liow and are sold off cheaper due to product clearance. He told me that expired engine oils can bring damage to the car which I don't know if it is true or not. If so, is it possible to check the expiry date? This is because when I checked the Eneos bottle itself, the production date seem as new as those stamped in the Eneos Kepong Jusco as well.</p><p></p><p>Hopefully, some good sifus can really tell me, because my friend said the sifus here knows nothing -.-</p></blockquote><p></p>
[QUOTE="Mishima, post: 4465259, member: 70430"] Oh yea, there's new question, I dunno is there anymore sifus to clarify this for me... They are:- 1) Will changing the gearbox gives more power-band and torque? Put in an example, fitting in a 4g15 gearbox into the 4g13 engine. 2) Is it possible to use the 4G13 engine but fit in 4G91 gearbox? If possible, which is better? 4G15 gb or 4G91 gb? 3) If convert the engine from Carburetor to EFI, will be boost performance as well be more fuel effective? What is the estimate cost of conversion, and is it worth it? 4) Lets say Carb with modded exhaust system converted to EFI, will it cause power loss and fuel inefficiency? 5) Now regarding engine oil, a friend of mine told me that engine oil has expiry dates. His mechanic that he promotes me to at Klang quoted me an oil change (oil + labour + filter) at RM80 for Eneos Eco Touring (15-40) at RM80 but Eneos Jusco Kepong is selling at much lower price. I asked why, he told me that the oil sold there surely 'expired' liow and are sold off cheaper due to product clearance. He told me that expired engine oils can bring damage to the car which I don't know if it is true or not. If so, is it possible to check the expiry date? This is because when I checked the Eneos bottle itself, the production date seem as new as those stamped in the Eneos Kepong Jusco as well. Hopefully, some good sifus can really tell me, because my friend said the sifus here knows nothing -.- [/QUOTE]
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